As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING ENGINE START, THE NR 2 STOP AND FEATHER CONTROL POPPED OUT 1/4 AT 10 PERCENT RPM. START ABORTED. THE NUT ON THE V-BAND OF THE NR 2 STARTER/GENERATOR HAD BACKED OFF ALLOWING THE STARTER/GENERATOR TO ROTATE STRIKING THE ENGINE CONTROLS. V-BAND HAD BEEN LOCKWIRED.