As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAULT LIGHT ON DURING START ATTEMPT. PERFORMED APU ECU BITE IAW FIM 49-11-00 NO FAULTS NOTED. VERIFIED APU OIL LEVEL, INDICATED FULL. VISUALLY INSPECTED APU NO DEFECTS NOTED. APU STARTED NORMALLY ON FIRST ATTEMPT. ALL OPS NORMAL. OK FOR SERVICE.