As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER THE LAST FLIGHT OF THE DAY, PILOT COULD NOT SHUT DOWN ENGINE BY CONDITION LEVER. INSP FOUDN THE PIVOT PIN HOLDING THE ARM TO THE FUEL CONTROL HAD WORKED OUT WHICH RELEASED THE ARM FROM FUEL CONTROL WHICH CAUSED LOSS OF PILOT CONTROL. SUSPECT THE COTTER PIN ON THE BACK SIDE OF PIVOT PIN WAS NOT INSTALLED AT ENGINE CHANGE.