What was found
ETOPS SIGNIFICANT SYSTEM, LT GENERATOR TRIPPED OFF AT CRUSE FL 370 CYCLED PER QRH RESET OK. TROUBLE SHOT PER FIM 24-11-00 FIG 101, HAD FAULT D9 THAT FAULTED GCU. RAN BITE TEST FOR GCU, ALL TESTS WERE NORMAL. NO PREVIOUS FLIGHT FAULTS, NO CURRENT FLIGHT FAULTS. OK FOR SERVICE.