As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAXI IN APU FAULT LIGHT ILLUMINATED. FOLLOWED QRH PROCEDURE. APU SWITCH OFF, NO RESTART ATTEMPTED. GROUNDED - YES. FAULT MESSAGE 49-41011 (NO FLAME SHUTDOWN). PERFORMED FIM TASK 49-40-00 TASK 802. REMOVED AND REPLACED IGNITION EXCITER UNIT WITH NEW PER AMM 49-41-31. OPS CHECK GOOD. NO FAULTS ON RESTART.