As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAULT 3 START ATTEMPTS NO START. ACCOMPLISHED BITE ON ECU-HAD "NO FLAME" WITH FAULT UNITS OF "IGN UNIT,"FUEL CONTROL" AND "NR 2 TC RAKE." REPLACED APU IGNITION UNIT AND IGNITION LEAD, AND IGNITION PLUG. STARTED APU ON FIRST ATTEMPT.