As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FAULT LIGHT ILLUMINATED DURING APU START. FOLLOWED QRH. AFTER 5 MIN RE-ATTEMPTED START AND LIGHT ILLUMINATED AGAIN. GROUNDED - YES. APU LAST FLIGHT LEG FAULT HISTORY SHOWS FAULT LIGHT MAINTENANCE MESSAGE 49-61157, ECU INTERNAL FAILURE. PERFORMED APU BITE PER FIM 49-60 TASK 804. PERFORMED APU BITE PER FIM 49-60 TASK 801. NO MAINTENANCE MESSAGES WERE SHOWN ON CURRENT STATUS PAGE. APU STARTED NORMALLY.