As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAILED TO START ON GROUND ILLUMINATION OF APU FAULT LIGHT. ACFT GROUNDED. ACCOMPLISHED FIM 49-60, TASK 801, APU BITE. NO CURRENT FAULT. MESSAGES 49-41012, NO ROTATION (4X) AND NO FLAME (2X) LOGGED. ACCOMPLISHED FIM TASKS 49-40 802 & 803. NO FAULTS FOUND. ECU R & R PRECAUTIONARY IAW AMM 49-61-12/401. INSTALLATION TEST GOOD. GROUND VERIFICATION SUCCESSFUL.