As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAULT LIGHT ILLUMINATED DURING START ATTEMPT. ACFT GROUNDED. R & R APU IAW TASK CARD 78349010. OPS CHECK IAW AMM 49-11-00-710-801. OPS & LEAK CHECKED GOOD. WHILE 49-99A APPLIED, APU FAULT LIGHT ILLUMINATED ON START RAN QRH WAITED 5 MINS LIGHT WENT OUT SECOND START SUCCESSFUL.