As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APPROXIMATELY 20 MINUTES INTO CRUISE FLIGHT, LEFT ENGINE OIL PRESSURE STARTED DROPPING. THE PILOT MADE A PRECAUTIONARY SHUT DOWN AND RETURNED TO HOT. THE LOW PRESSURE OIL LINE GOING FROM THE PROP PITCH CONTROL TO THE GOVERNOR WAS FOUND LEAKING. THE LINE WAS REPLACED AND GROUND RUNS CHECKED NORMAL.