As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STARTED THE APU, FAULT LIGHT ILLUMINATED. FOLLOWED QRH 7.2 AFTER FAULT LIGHT WENT OUT. ATTEMPTED TO RESTART APU, RECEIVED A FAULT LIGHT AGAIN. ACFT GROUNDED. ACCOMPLISHED FIM 49-40, TASK 802. REMOVED AND REPLACED APU IGNITION UNIT IAW AMM 49-41-31. REMOVED AND REPLACED IGNITER PLUG IAW AMM 49-41-51. REMOVED AND REPLACED IGNITER PLUG LEAD IAW AMM 49-41-52. STARTED APU SEVERAL TIMES, NO FAULTS NOTED.