As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE, AT AN ALTITUDE OF 10,000 FEET, THE PILOT NOTICED A REDUCTION IN MANIFOLD PRESSURE AND POWER FOR THE LEFT ENGINE. THE LEFT PROPELLER STARTED TO FEATHER. THE PILOT SHUT DOWN THE LEFT ENGINE AND LANDED AIRCRAFT WITHOUT FURTHER INCIDENT. POST FLIGHT INSPECTION FOUND THE LEFT PROPELLER GOVERNOR HAD FAILED INTERNALLY. SUBMITTED TO CORRECT PREVIOUSLY SUBMITTED SDR, OPERATOR CONTROL #BHA06RS