As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING PRE-INSPECTION GROUND RUN, ENGINE WAS SHUTDOWN IAW CHECK, IGNITION KEY OFF AND MASTER OFF. WHEN POWER MASTER WAS RE-SELECTED ON, THE STARTER ENGAGED IMMEDIATELY WITH THE IGNITION KEY IN THE OFF POSITION. MASTER TURNED OFF AND CRANKING CEASED.