As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU WILL NOT START. STARTER WOULD NOT ENGAGE CHECKED FADEC. FOUND REVERSE FLO MESSAGE CLEARED. STILL NO START. APU DID NOT START 4 TIMES, APU NOT CRANKING. REPLACED APU STARTER PER AMM AND REPLACED APU CRANK CONTACTOR PER AMM. DID APU BITE TEST AND RAN APU TWICE WITH NORMAL START PER AMM.