On the morning of the first launch attempt, on 1 July, concerns included weather, external fuel tank foam, and a thruster failure. The thruster failure was detected via abnormally low thermostat readings in one of the left Orbital Maneuvering System (OMS) pods. The thruster in question – L5L, one of 38 – was considered inoperable. The plan was not to fix the problem, but to ensure that any reduction in maneuverability resulting from the failure is within the limits that the crew can cope with on orbit. Thruster L5L became operational again after mission managers decided to use sunlight to warm up the thruster to normal operational levels and it was able to be used during the docking procedures with the ISS.