As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS SIGNIFICANT SYSTEM - EICAS MESSAGE LT GEN OFF DISPLAYED. LT GEN OFF LIGHT ILLUMINATED, GENERATOR SWITCH RESET DID NOT CORRECT CONDITION. BITE BPCU FOUND LT OPEN PHASE/TRIP/GEN FDR UNDER VOLT TRIP & OPEN POR/FDR/GEN. REMOVED & REPLACED NR 1 EN IDG AS PER AMM34-11-01.LEAK & OPS CHECKED OK PER AMM24-11-00