Today workers will install the vertical payloads into the orbiter.
Preparations are under way for tomorrow's helium signature leak test.
Fuel servicing of Endeavour's auxiliary power units was performed yesterday. Auxiliary power converter unit inspections began yesterday and will conclude today. Functional tests on the orbiter's main landing gear are in work. Tomorrow, workers will stow the flight crew equipment in preparation for the Crew Equipment Interface Test on Saturday. Preparations for payload bay door closure are under way.