During the mission, the shuttle docked to PMA 3 located on the nadir of Node 1. The crew relocated PMA 2 to the holding area on the Z1 truss temporarily, before using the Shuttle's robotic arm to lift out the 14.5 ton steel module out of the Shuttle's payload bay, and permanently berthed it on the forward hatch of Node 1. Spacewalks conducted by Thomas Jones and Robert Curbeam reattached electrical cables to the stainless steel hull and connecting ports on "Destiny", and also checked the laboratory's nadir window. PMA 2 was replaced to the forward hatch of Destiny.