As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
VFR FROM MARSHALLTOWN TO DSM. RT ENGINE QUIT, PILOT WENT THROUGH THE CHECK LIST AND FEATHERED THE ENGINE. THE FUEL SELECTOR COULD NOT MOVE. THE A/C HAD BEEN STORED IN A HEATED HANGAR OVERNIGHT. OPERATOR TOOK SAMPLES OF FUEL AND NOTHING FOUND. TEST FLEW OKAY.