As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAILED TO START. FAULT LIGHT ILLUM AND EICAS MSG. APU FAULT DISPLAYED. NO MSG ON BOX. ONE AUTO EVENT 35 PERCENT 770 DEG. HOOKED TESTER UP COULD NOT GET TO FAULT. DOOR CIRCUIT NEVER FAILED. CHECKED INLET FOR BLOCKAGE OKAY. NO SPIKE VOLT FROM CHARGER. REPLACED THE FUEL CONTROL AND STARTER.