As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAILED TO START AFTER LANDING. PERFORMED BITE CHECK OF ECU ABOUT START MESSAGE IAW AMM 49-61-05, SYSTEM TEST OK. PERFORMED PHYSICAL OIL CHECK AND SERVICED APU OIL IAW AMM 12-13-04. APU STARTED NORMAL ON 2ND ATTEMPT. OPS CHECK GOOD.