As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAULT LIGHT CAME ON AFTER START ATTEMPT, AFTER LANDING. IAW QRH ATTEMPTED ANOTHER START AFTER 5 MINS. AND FAULT LIGHT EXTINGUISHED. FAULT LIGHT ILLUMINATED AGAIN AFTER SECOND START ATTEMPT. ACFT GROUNDED. CLEARED FAULT IAW FIM, OPS CHECK NORMAL AT THIS TIME.