One in, one out – Discovery and Endeavour tag for next mission

Endeavour has safely returned to her Orbiter Processing Facility (OPF-2), following the highly successful STS-130 mission – which concluded on Sunday night with a safe landing at the Shuttle Landing Facility (SLF). Only hours after all three orbiters were reunited in the OPFs, Discovery bid her farewells and rolled over to the Vehicle Assembly Building (VAB), in preparation for her STS-131 mission in April.
STS-134 Processing Latest:

Endeavour is technically into STS-134 processing, although the coming weeks will concentrate on safing the vehicle, along with work on what is described as only a few minor dings to her Thermal Protection System (TPS). The current flow is known as “OPF Integrated roll-in ops”.
At least three windows are expected to be replaced, following the MMOD (Micro-Meteoroid Orbital Debris) events on orbit – although several windows are usually changed-out as a matter of course for a post-flight flow.
Engineers have only a few additional items to check as a result of Endeavour’s performance on STS-130, such as Fuel Cell 2’s instrumentation – which required a workaround after failing a self-test after undocking. All three Fuel Cells performed nominally during the mission – as did all of the orbiter’s systems, leading to high ...