As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER DEPARTING, THE NR 2 AC GENERATOR WENT OFF LINE. THE AIRCRAFT RETURNED TO POINT OF DEPARTURE. MAINTENANCE REPLACED THE GCU WHICH DID NOT RECTIFY THE PROBLEM. FURTHER INVESTIGATION REVEALED THAT ARCHING BETWEEN THE AC HARNESS AND THE ENGINE CASE AT THE (D) FLANGE HAD OCCURRED.