As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ENGINE START APU POWER FAILED AFTER START COMPLETE HAD AN EEC ALTN LIGHT ON ENG NR 1. PERFORMED FIM TASK 73 05 00 810 811 F00 ENG NR 1 ALTN LIGHT ON. ALL LOGGED FAULTS APPEAR RELATED TO LOSS OF APU ELECTRICAL POWER. APU GENERATOR SYSTEM CHECKED & RELEASED PER MEL 24 2B. PERFORMED FIM 24 21 00 810 801. NO FAULTS. PERFORMED OPERATIONAL TEST OF AC GEN & CTRL SYSTEM. OPS CHECK GOOD.