As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED OIL PRESSURE FLUCTUATING. MOVED THE PROPS FULL FORWARD FOR LANDING. SHORTLY AFTER HAD AN OIL PRESSURE LIGHT FOLLOWED BY A DECREASE IN PROP RPM. PROCEEDED TO PERFORM AN IN-FLIGHT PRECAUTIONARY SHUTDOWN. LANDED WITHOUT FURTHER INCIDENT. DECLARED AN EMERGENCY AFTER ENGINE SHUTDOWN. MAINTENANCE FOUND A PROP GOVERNOR LUBRICATION LINE LEAKING, AND REPLACED IT. ENGINE OIL SERVICED.