Adding insulation blankets around two critical solar array drive, but they were unable to tighten up a solar array support truss

Disconnect Z1 to P6 truss cables and unbolt P6; outfit outside Node 2 with handrails, worksite interface fixtures, gap spanners and install thermal covers, remote Node 2 berthing mechanism restraints; install grapple fixture on Node 2; configure squib firing unit on S1 truss for deploying radiators.

Complete the exterior hookup of Harmony. Much of the spacewalk included the moving of a 300-pound, 18.5-foot fluid tray from its temporary location at the center of the station's main truss to Harmony.

Complete the exterior hookup of Harmony. Much of the spacewalk included the moving of another 300-pound, 18.5-foot fluid tray from its temporary location at the center of the station's main truss to Harmony.

Examination of the starboard Solar Alpha Rotary Joint (SARJ) and return a trundle assembly to the station's interior.

Replacing a motor with electrical failures, the Bearing Motor Roll Ring Module (BMRRM), called the 'broom". The motor drives the starboard solar wings as they tilt along their axis to follow the sun for optimal power generation as the station orbits the Earth. The second main goal of the spacewalk was inspection of the starboard Solar Alpha Rotary Joint (SARJ). That device causes the starboard solar wings to rotate in a paddlewheel-like motion to keep the arrays pointed toward the sun.