As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
''APU GEN OFF BUS'' LIGHT ON IN FLIGHT. RESET AS PER QRH. RESET FOR APPROXIMATELY 10 SECONDS THEN ''OFF BUSS''CAME ON AGAIN. RETURNED TO FIELD. REMOVED AND REPLACED APU STARTER/GENERATOR IAW 24-30-00. OPS CHECK GOOD.P/N: 23080-015 S/N ON: 98543 S/N OFF: 96115