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. ACFT GROUNDED. ACCOMPLISHED FIM TASK 49-40 TASK 802 AS REQUIRED. FOUND APU EXCITER, CONNECTOR, AND LEAD BAD. REMOVED AND REPLACED EXCITER IGNITION UNIT IAW AMM 49-41-31. REMOVED AND REPLACED IGNITER CONNECTOR IAW AMM 49-41-51. REMOVED AND REPLACED IGNITED CONNECTOR LEAD IAW AMM 49-41-52. RAN APU, OPS CHECKED GOOD.