As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAILED TO START & FAULT LIGHT ILLUMINATED. AFTER 5 MINUTES FAULT LIGHT WENT OUT. 2ND ATTEMPT TO START AND FAILED AGAIN WITH FAULT LIGHT. ACFT GROUNDED. COMPLIED WITH FIM 49-40, TASK 802. FOUND IGNITER WORN. R & R APU IGNITER PLUS REF AMM 49-41-51/ 401. OPS CHECKS GOOD, FUEL FLOW RATE WAS 56PPH. CDU REPORTS NO FAULTS. STARTED APU 3 TIMES. NO DEFECTS NOTED.