As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MSP - FLT 421 - ON ENGINE SHUT DOWN, THE LEFT ENGINE SMOKED WHEN THE PROP WAS PULLED THROUGH. INSPECTION FOUND THE FUEL SHUTOFF WAS LEAKING FUEL PAST WHEN THE VALVE WAS CLOSED. THE FUEL SHUTOFF WAS REPLACED AND THE AIRCRAFT WAS RELEASED. (M)