As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
1ST ATTEMPT ON APU START AFTER LANDING GOT AN APU FAULT LIGHT. RAN QRH TURNED OFF APU SWITCH. AFTER APPROX 3 MIN LIGHT EXTINGUISHED. STARTED APU NORMALLY ON SECOND ATTEMPT. ACFT GROUNDED. FOUND FAULT 49-41254 LOGGED IN HISTORY. FOLLOWED FIM 49-40 TASK 821, NO HISTORY 30 DAYS. STARTED APU 3 TIMES, ALL STARTS GOOD. FAULT 49-41254 IN HISTORY ONLY. NO CURRENT FAULTS.