As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EICAS MESSAGE "ELEC GEN OFF 3" GCB RESET PER QRH, OPERATION NORMAL MOMENTARILY THEN REOCCURRENCE. DIVERTED TO NRT. FOUND CHAFF ON NR 3 IDG T2 HARNESS. PERFORMED REPAIR AS PER SWPM 20-10-13 PAGE 41 PART 2T. THIS ITEM MUST BE REPAIRED WITHIN 500 FLIGHT HOURS.