As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAILED TO START, 3 ATTEMPTS. REPLACED IGNITOR PLUG, LEAD AND EXCITER BOX, NO HELP. APU RPM 18 EGT RISES. CONTROL BOX STILL FAULTING NO FLAME. CONFIRM APU FUEL S-O VALVE IS 'OPEN' WITH APU MASTER SW ON. REPLACED FUEL CONTROL. LEAK CHECK AND OP CHECK GOOD.