The P-6 truss and twin solar array were launched in late 2000 (STS-97, December 2000) to provide the initial electricity to the station’s growing U.S. segment. It was moved to its permanent port-side outboard location in late 2007 (STS-120, October-November 2007).

Potential sources of the leak include the coolant pump, radiator or the plumbing associated with the 12-year-old truss.

As far as the short, station engineers are looking at several possible culprits, including a direct current switching unit, a voltage regulating sequential shunt unit or the beta gimbal assembly that adjusts the angle of the solar panels to the Sun.