What was found
THE APU FAULT LIGHT ILLUMINATED, THE APU SHUTDOWN & THE EICAS MSG APU FAULT DISPLAYED. THE CREW PERFORMED AN AIR TURN BACK. FOUND THE DIFFICULTY WAS SWITCHES OUT OF ADJUSTMENT IN THE APU AIR INTAKE DOOR ACTUATOR.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
THE APU FAULT LIGHT ILLUMINATED, THE APU SHUTDOWN & THE EICAS MSG APU FAULT DISPLAYED. THE CREW PERFORMED AN AIR TURN BACK. FOUND THE DIFFICULTY WAS SWITCHES OUT OF ADJUSTMENT IN THE APU AIR INTAKE DOOR ACTUATOR.