As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAULT EICAS MESSAGE. APU WOULD NOT START AFTER LANDING, MOMENTARY APU DOOR STATUS MESSAGE APPEARED. 2 START ATTEMPTS. PERFORMED BITE TEST OF THE APU ECU, NO FAULTS FOUND. OPS CHECK OK, APU STARTED ON FIRST ATTEMPT BY MX. OPS CHECK OK AS PER AMM 49-41-00 AND 49-61-05.