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 THE LEFT ENGINE OIL PRESSURE STARTED DROPPING. THE PILOT MADE A PRECAUTIONARY SHUTDOWN AND RETURNED TO HOT. THE LOW PRESSURE OIL LINE GOING FROM THE PROP PITCH CONTROL TO THE GOVERNOR WAS FOUND TO BE LEAKING. THE LINE WAS REPLACED AND GROUND RUNS CHECKED NORMAL. (Z)