As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAULT ILLUMINATED AFTER ATTEMPTED START. GROUNDED - YES. PERFORMED APU BITE PER FIM 49-60 TASK 801, APU SHOWS CURRENT STATUS MESSAGE FAULT 49-41254 "START CONVERTER UNIT SHOWS START SYSTEM INOP" NO ROTATION SHUTDOWN. PERFORMED FIM 49-40-TASK 821 APU STARTED NORMALLY 5 TIMES - NO FAULT CODES IN FAULT HISTORY OR CURRENT STATUS PAGE. APU OPS CHECKS OK.