Astronaut Robert Behnken replaced a faulty space station circuit breaker today but fellow spacewalker Michael Foreman was unable to disconnect an electrical cable as part of a patch panel reconfiguration. As a result, flight controllers were not immediately able to switch one of the station's four stabilizing gyroscopes back to its own power supply as planned.

Before beginning the patch panel work, Foreman reported an apparent strike from a micrometeoroid on a tool box door.

"And Rick, I don't know if you can see this from up here, but on the port door, lower hinge, there's a nice crater right there by my right index finger," Foreman radioed.

"We do see that Mike, and it's good you're doing this inspection," Richard Linnehan called from inside the shuttle. "I didn't pick that up in the dark."

"Yeah, that looks like a direct hit from something else," Foreman observed.

A few minutes later, both spacewalkers ran into problems. Behnken wasn't initially able to get the failed circuit breaker, known as a remote power control module, or RPCM, out of its slot in a rack in the S0 truss; and Foreman was unable to disconnect a cable from an electrical patch panel as required.

"The (connector-locking) bale is past the over center, all the way back," Foreman radioed.

"Houston, do you think it's worth a cycle on the bale, back and forth, would that help, maybe, loosen it?" Linnehan asked.

"I think where it clicks in there, it's just not coming out," Foreman said. "Can I tap it with a waist tether or something?"

"And Rick, I've also got eight turns in there," Behnken joined in. "The RPCM did move to the unlock position, but it still seems to be engaged."

A few minutes later, however, he managed to pull the RPCM out of its slot.

"Bob, good work, I see you got that RPCM out now," Linnehan radioed.

"Yeah, I just kept wiggling it," Behnken said. "It was a little ornerier than I thought it would be."

Foreman, meanwhile, was still having problems with the stuck cable connector.

"Send Bam Bam up here!" he said, referring to Behnken. Behnken was on his way back to the airlock to retrieve the equipment needed for a heat shield tile repair demonstration.

Foreman made several more attempts to free the cable before Flight Director Dana Weigel, a former spacewalk planner, decided to call of the effort and to leave the connector in place.

"Endeavour, Houston, for EVA. We can see Mike trying his absolute best," astronaut Steve Robinson radioed from Houston. "We think at this point, if you guys concur, that it's time to re-throw the bale, put the cap back on and move on to greener pastures."

"Sounds good, Steve. Sorry about that, guys," Foreman replied.

"Good work, Mike, thanks for sticking with it that long," Linnehan said.

Lead Flight Director Mike Moses said one of the goals of the RPCM swap-out and cable reconfiguration was to restore lost redundancy to control moment gyro No. 2, one of four used to stabilize the space station and change its orientation as required. Because of the earlier RPCM failure, CMG-2 was tied into the power circuit supplying CMG-3.

"Both are being fed by one unit so if that one failed, it would take down two CMGs," Moses said earlier today. "We prefer them to each be on their own to provide redundancy.

Today's spacewalk began at 6:04 p.m., some 24 minutes ahead of schedule.

Additional coverage for subscribers:
VIDEO: TILE REPAIR DEMONSTRATION PREVIEW PLAY
VIDEO: NARRATED PREVIEW OF SPACEWALK NO. 4 PLAY
VIDEO: NARRATED ANIMATION OF FUTURE DEXTRE WORK PLAY
VIDEO: NARRATED ANIMATION OF JAPAN'S SECTION OF ISS PLAY

VIDEO: LAUNCH VIDEO FROM COCKPIT CAMERA W/INTERCOM PLAY

VIDEO: THE FLIGHT DAY 10 HIGHLIGHTS MOVIE PLAY
VIDEO: WEDNESDAY'S MISSION STATUS BRIEFING PLAY
VIDEO: CREW MEDIA INTERVIEWS WEDNESDAY NIGHT PLAY
VIDEO: JAPANESE VIP CALL TO STATION PLAY

VIDEO: THE FLIGHT DAY 9 HIGHLIGHTS MOVIE PLAY
VIDEO: TUESDAY NIGHT'S MISSION STATUS BRIEFING PLAY
VIDEO: LAUNCH CARRIER PALLET RETURNED TO SHUTTLE PLAY
VIDEO: DEXTRE ROBOT ATTACHED TO DESTINY LAB MODULE PLAY
VIDEO: NARRATED ANIMATION OF DEXTRE'S RELOCATION PLAY

VIDEO: THE FLIGHT DAY 8 HIGHLIGHTS MOVIE PLAY
VIDEO: TUESDAY MORNING'S MISSION STATUS BRIEFING PLAY
VIDEO: DEXTRE ROBOT FREED FROM LAUNCH PALLET PLAY
VIDEO: SECOND SPARE DCSU BOX PLACED ON THE STATION PLAY
VIDEO: SPACEWALKER UNABLE TO INSTALL MISSE EXPERIMENT PLAY
VIDEO: FIRST SPARE DCSU BOX PLACED ON THE STATION PLAY
VIDEO: SPARE YAW JOINT FOR STATION ARM TRANSFERRED PLAY
VIDEO: MOUNTING PLATE ATTACHED TO COLUMBUS PLAY
VIDEO: DEXTRE ROBOT FITTED WITH TOOL HOLDER PLAY
VIDEO: TOOL PLATFORM ATTACHED TO DEXTRE PLAY
VIDEO: NARRATED PREVIEW OF SPACEWALK NO. 3 PLAY

VIDEO: LEFT-HAND BOOSTER CAMERA LOOKING UPWARD PLAY
VIDEO: LEFT-HAND BOOSTER CAMERA LOOKING INBOARD PLAY
VIDEO: LEFT-HAND BOOSTER CAMERA LOOKING DOWNWARD PLAY
VIDEO: RIGHT-HAND BOOSTER CAMERA LOOKING UPWARD PLAY

VIDEO: THE FLIGHT DAY 7 HIGHLIGHTS MOVIE PLAY
VIDEO: DEXTRE MOVES ARMS FOR BRAKE TESTS PLAY
VIDEO: CREW MEDIA INTERVIEWS SUNDAY NIGHT PLAY
VIDEO: SUNDAY NIGHT'S MISSION STATUS BRIEFING PLAY

VIDEO: THE FLIGHT DAY 6 HIGHLIGHTS MOVIE PLAY
VIDEO: SUNDAY'S MISSION STATUS BRIEFING PLAY
VIDEO: SECOND ARM ATTACHED TO DEXTRE ROBOT PLAY
VIDEO: FIRST ARM ATTACHED TO THE DEXTRE ROBOT PLAY
VIDEO: SPACEWALKERS HELP DEXTRE DO A SIT-UP PLAY
VIDEO: SECOND DEXTRE ARM PULLED FROM LAUNCH CARRIER PLAY
VIDEO: FIRST ARM REMOVED FROM PALLET WITH FORCE PLAY
VIDEO: NARRATED PREVIEW OF SPACEWALK NO. 2 PLAY

VIDEO: THE FLIGHT DAY 5 HIGHLIGHTS MOVIE PLAY
VIDEO: SATURDAY MORNING MEDIA INTERVIEWS PLAY
VIDEO: STATION ARM GRAPPLES DEXTRE TO PROVIDE POWER PLAY
VIDEO: CEREMONY AT JAPANESE MODULE HATCH OPENING PLAY
VIDEO: SATURDAY'S MISSION STATUS BRIEFING PLAY
VIDEO: FRIDAY'S MISSION MANAGEMENT TEAM UPDATE PLAY

VIDEO: THURSDAY'S MISSION STATUS BRIEFING PLAY
VIDEO: THE FLIGHT DAY 4 HIGHLIGHTS MOVIE PLAY
VIDEO: NEW MODULE CONNECTED TO THE STATION PLAY
VIDEO: JAPANESE MODULE UNBERTHED FROM SHUTTLE PLAY
VIDEO: SPACEWALKER START ASSEMBLING DEXTRE ROBOT PLAY
VIDEO: JAPANESE MODULE PREPPED FOR UNBERTHING PLAY
VIDEO: HARMONY DOCKING PORT PREPPED PLAY
VIDEO: SPACEWALK NO. 1 BEGINS PLAY
VIDEO: NARRATED ANIMATION PREVIEWING JAPANESE JLP MODULE PLAY
VIDEO: NARRATED ANIMATION PREVIEWING MODULE MOVE PLAY
VIDEO: NARRATED PREVIEW OF SPACEWALK NO. 1 PLAY
VIDEO: THURSDAY'S MISSION MANAGEMENT TEAM UPDATE PLAY

VIDEO: THE FLIGHT DAY 3 HIGHLIGHTS MOVIE PLAY
VIDEO: DEXTRE PALLET MOVED FROM SHUTTLE TO STATION PLAY
VIDEO: NARRATED ANIMATION PREVIEWING DEXTRE ROBOT PLAY
VIDEO: NARRATED ANIMATION PREVIEWING PALLET MOVE PLAY
VIDEO: THURSDAY'S MISSION STATUS BRIEFING PLAY
VIDEO: SHUTTLE CREW WELCOMED ABOARD STATION PLAY
VIDEO: DOCKING REPLAY FROM OTHER TRUSS CAMERA PLAY
VIDEO: SHUTTLE ENDEAVOUR DOCKS TO SPACE STATION PLAY
VIDEO: ENDEAVOUR PERFORMS THE 360-DEGREE BACKFLIP PLAY
VIDEO: VIEWS OF THE SHUTTLE APPROACHING FROM BELOW PLAY
VIDEO: NARRATED ANIMATION OF PREVIEWING THE DOCKING PLAY
VIDEO: UPDATE FROM MISSION MANAGEMENT TEAM PLAY

VIDEO: THE FLIGHT DAY 2 HIGHLIGHTS MOVIE PLAY
VIDEO: WEDNESDAY'S MISSION STATUS BRIEFING PLAY
VIDEO: ANIMATION OF THE HEAT SHIELD INSPECTIONS PLAY
VIDEO: NARRATED TOUR OF ENDEAVOUR'S PAYLOAD BAY PLAY

VIDEO: THE FLIGHT DAY 1 HIGHLIGHTS MOVIE PLAY
VIDEO: INSIDE MISSION CONTROL DURING LAUNCH PLAY
VIDEO: THE FULL LAUNCH EXPERIENCE PLAY
VIDEO: SHUTTLE ENDEAVOUR BLASTS OFF! PLAY
VIDEO: THE POST-LAUNCH NEWS CONFERENCE PLAY
VIDEO: HIGHLIGHTS FROM ENDEAVOUR'S LAUNCH CAMPAIGN PLAY
VIDEO: HIGHLIGHTS OF THE PAYLOADS' LAUNCH CAMPAIGN PLAY

VIDEO: LAUNCH REPLAY: VAB ROOF PLAY
VIDEO: LAUNCH REPLAY: PAD FRONT PLAY
VIDEO: LAUNCH REPLAY: PRESS SITE PLAY
VIDEO: LAUNCH REPLAY: WEST TOWER PLAY
VIDEO: LAUNCH REPLAY: PAD PERIMETER PLAY
VIDEO: LAUNCH REPLAY: UCS-23 WIDESCREEN PLAY
VIDEO: LAUNCH REPLAY: CAMERA 009 PLAY
VIDEO: LAUNCH REPLAY: CAMERA 049 PLAY
VIDEO: LAUNCH REPLAY: CAMERA 050 PLAY
VIDEO: LAUNCH REPLAY: CAMERA 051 PLAY
VIDEO: LAUNCH REPLAY: CAMERA 054 PLAY
VIDEO: LAUNCH REPLAY: CAMERA 061 PLAY
VIDEO: LAUNCH REPLAY: CAMERA 063 PLAY
VIDEO: LAUNCH REPLAY: CAMERA 070 PLAY
VIDEO: LAUNCH REPLAY: CAMERA 071 PLAY
VIDEO: LAUNCH REPLAY: CAMERA CS-1 PLAY
VIDEO: LAUNCH REPLAY: CAMERA CS-2 PLAY
VIDEO: LAUNCH REPLAY: CAMERA CS-6 PLAY

VIDEO: FINAL PRE-LAUNCH POLLS GIVE "GO" FOR LIFTOFF PLAY
VIDEO: ENDEAVOUR'S CREW MODULE CLOSED FOR FLIGHT PLAY
VIDEO: ASTRONAUT DOI CLIMBS INTO HIS SEAT PLAY
VIDEO: PILOT JOHNSON CLIMBS INTO HIS SEAT PLAY
VIDEO: ASTRONAUT REISMAN CLIMBS INTO HIS SEAT PLAY
VIDEO: COMMANDER GORIE CLIMBS INTO HIS SEAT PLAY
VIDEO: ASTRONAUTS ARRIVE AT LAUNCH PAD 39A PLAY
VIDEO: CREW DEPARTS QUARTERS FOR LAUNCH PAD PLAY
VIDEO: ASTRONAUTS DON SPACESUITS FOR LAUNCH PLAY
VIDEO: TIME-LAPSE MOVIE OF SUNSET OVER PAD 39A PLAY
VIDEO: MORNING PREPARATIONS AT LAUNCH PAD 39A PLAY
VIDEO: PAD GANTRY RETRACTED FOR LAUNCH PLAY

VIDEO: OVERVIEW BRIEFING ON CANADA'S DEXTRE ROBOT PLAY
VIDEO: OVERVIEW BRIEFING ON JAPAN'S KIBO FACILITIES PLAY
VIDEO: SUNDAY'S COUNTDOWN STATUS BRIEFING PLAY
VIDEO: SATURDAY'S COUNTDOWN STATUS BRIEFING PLAY
VIDEO: CREW ARRIVES AT KENNEDY SPACE CENTER FOR LAUNCH PLAY
VIDEO: FRIDAY'S COUNTDOWN STATUS AND WEATHER BRIEFING PLAY

VIDEO: STS-123 ASTRONAUT BIOGRAPHY MOVIE PLAY
VIDEO: NARRATED SHORT FILM PREVIEW ENDEAVOUR'S FLIGHT PLAY

VIDEO: STS-123 MISSION OVERVIEW BRIEFING PLAY
VIDEO: BRIEFING ON THE SPACEWALKS PLAY
VIDEO: CREW'S PRE-FLIGHT BRIEFING PLAY
VIDEO: SHUTTLE AND ISS PROGRAM UPDATE PLAY

VIDEO: CREW INTERVIEW: COMMANDER DOM GORIE PLAY
VIDEO: CREW INTERVIEW: PILOT GREG JOHNSON PLAY
VIDEO: CREW INTERVIEW: MS1 BOB BEHNKEN PLAY
VIDEO: CREW INTERVIEW: MS2 MIKE FOREMAN PLAY
VIDEO: CREW INTERVIEW: MS3 TAKAO DOI PLAY
VIDEO: CREW INTERVIEW: MS4 RICK LINNEHAN PLAY

VIDEO: FLIGHT READINESS REVIEW NEWS BRIEFING PLAY
VIDEO: TCDT TRAINING HIGHLIGHTS PLAY
VIDEO: PRESS CHAT WITH CREW AT LAUNCH PAD PLAY
VIDEO: CREW ARRIVES AT KSC FOR PRACTICE COUNT PLAY
VIDEO: ENDEAVOUR ARRIVES AT PAD 39A PLAY | XL SIZE
VIDEO: SHUTTLE ROLLS TO THE VAB PLAY | XL SIZE
MORE: STS-123 VIDEO COVERAGE
SUBSCRIBE NOW