troubleshooting would be needed. The second problem occurred during the installation of the SGANT, and was related to the Command and Control (CNC) computers. During installation, when Steve Bowen removed a cover from a connector, the prime CNC computer detected an error and shut down. The cap was a special cap which allowed the circuit for that connector to be closed, so when it was opened the sensor detected an error. The shut down of the CNC caused a 2-minute loss of communications. The safeing of the computer also stopped the Canadarm2 for a reconfiguration of the cameras being used during the spacewalk by both the robotic arm operators and observers on the ground. The spacewalk ended at 19:19 UTC, after Reisman and Bowen made an inventory of the tools they brought with them and made their way back into the Quest airlock. STS-132's EVA 1 was the 237th conducted by U.S. astronauts, the second for Reisman and the fourth for Bowen. It was also the 144th in support of ISS assembly and maintenance. For EVA 1, lead spacewalker Reisman had a spacesuit with no stripes. Bowen' spacesuit was marked with a red stripe. The shuttle's robotic arm also successfully grappled the MRM-1 module in Atlantis' cargo bay in preparation for its berthing to the Zarya service module the following day. May 18 (Flight Day 5 – MRM1 installation) On flight day 5, the crew focused on the addition of the MRM-1 module to the space station. Commander Ken Ham and pilot Tony Antonelli maneuvered Atlantis' robotic arm to unberth MRM-1 from the shuttle's payload bay at 09:49 UTC, and handed it off to the station's Canadarm2 at 10:14 UTC. Mission Specialists Garrett Reisman and Piers Sellers, working from inside the station's Cupola, then maneuvered the Canadarm2 arm to deliver MRM-1 to its new position, the Earth-facing port of the Zarya service module. The docking occurred at 12:20 UTC when the shuttle-station stack was flying above Argentina. Following the successful docking, Sellers reported to Mission Control that, during the docking, he did not see the expected "capture 1" confirmation signal appear on his laptop, to which CAPCOM Steve Swanson replied "And station, that error's expected. The reason you didn't get 'contact 1' is because Garrett did too good of a job flying. He went right down the middle and got a hole in one." Expedition 23 Commander Oleg Kotov also