As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU DID NOT CRANK, APU DOOR FAULT ON LOWER EICAS. TROUBLESHOT THE SYSTEM AND FOUND THAT APU DOOR ACTUATOR WAS NOT EQUIPPED WITH PROPER VOLTAGE TO OPERATE. CHARGED THE APU BATTERY WITH APU BATTERY CHARGER IAW AMM 24-31-05-424-007, STEP E. APU OPS CHECKED GOOD IAW AMM 49-11-00-802-002.