As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU DID NOT SHUTDOWN ON GROUND AFTER APU SWITCH MOVED TO OFF POSITION. APU SWITCH WAS MOVED SLIGHTLY TOWARDS THE ON POSITION AND THE APU SHUTDOWN. PERFORMED APU STARTING AND OPERATION, USUAL SHUTDOWN OPS CHECKED GOOD, INPUT MONITORING AND START SWITCH POSTION CHECKED GOOD IAW MM 49-11-00 BITE CHECK SHOWS NO FAULTS.