As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TRIED TO START APU AFTER LOSS OF GROUND POWER. APU DIDN'T START AND HAD FAULT LIGHT. NO DAMAGE NOTED AT APU EXHAUST AREA. ACCOMPLISHED APU BITE TEST REF FIM TASK 49 60 00 801 801 NO FAULT NOTED OPERATED APU SEVERAL TIMES WITH LOAD OPS NORMAL.