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.