As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING AN INSPECTION OF THE FUEL SELECTOR VALVE, WHEN REMOVING THE SELECTOR HANDLE THERE SHOULD BE A ROLL PIN TO PREVENT THE CONTROL HANDLE FROM BEING REPLACED IN THE WRONG POSITION. THE PIN WAS MISSING ALLOWING THE SELECTOR TO BE POSITIONED WRONG.