As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT AIR TURN BACK, APU FAILED DURING CLIMB AND RT GENERATOR WAS INOPERATIVE. AIRCRAFT LANDED WITH 84367 KG AND MAXIMUM LANDING WEIGHT IS 85811 KG IAW DISPATCH MANUAL 5-3-1/2 NOT REQUIRING OVERWEIGHT LANDING INSPECTION. MAINTENANCE PERSONNEL REPLACED RT INTEGRATED DRIVE GENERATOR (IDG) IAW MM 24-11-01 AND APU FCU AND SURGE VALVE IAW MM 49-31-01 AND 49-53-01 RESPECTIVELY, TESTED CORRECT.