As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 GEN SOURCE OFF LIGHT CAME ON IN FLIGHT WOULD NOT RESET / APU COVERED THE BUS. GCU 1 SHOWS IDG FAULT. REPLACED NR 1 ENG IDG PER MM 24 11 11 000 801 AND 24 11 11 400 801. PERFORMED OPERATIONAL TEST REF AMM 24 11 00 700 802. OPS CHECK GOOD.