Prepare connecting mechanisms for Kibo and the exposed facility, which the station's robotic arm will install later in the day. They also released bolts on an ammonia tank assembly as get-ahead work for the next shuttle mission, STS-128. Then, both worked to deploy the unpressurized cargo carrier attachment system (UCCAS) on the Port 3 truss that was jammed and couldn't be done on STS-119. The UCCAS will be used in the future to store equipment and supplies on the outside of the station.

The pair moved the station's mobile transporter rail car so it can be latched in place ahead of the docking of a Russian cargo resupply spacecraft on December 23, 2015.

The astronauts replaced a failed voltage regulator that compromised one of the station's eight power channels on November 13, 2015. The unit was relatively easy to replace because it is a simple box that can be removed by undoing one bolt. Additional tasks included deploying cables for the future installation of an International Docking Adapter (IDA) that will accommodate U.S. commercial crew vehicles, and retrieving a broken light from a truss camera.