As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU WOULD NOT START. FAULT LIGHT ILLUMINATED. ACFT GROUNDED. FAULT HISTORY SHOWS MAINT. MESSAGE 49-41180 IGNITION UNIT SHOWS HIGH CURRENT. PERFORMED GVI ON APU WIRING HARNESS AND WIRING CHECKS BETWEEN P3 CONNECTOR AND P13 CONNECTOR. CHECKED GOOD IAW FIM 49-40 TASK 804. PERFORMED APU START. NO CURRENT FAULTS AND START GOOD IAW AMM 49-11-00.