As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE HAD LOST OIL PRESSURE DURING FLIGHT. AFTER A SAFE LANDING IT WAS DETERMINED THAT THE OIL HAD LEAKED OUT FROM THE BETWEEN THE OIL COOLER PLATE AND THE ENGINE. THE OIL COOLER PLATE ATTACHMENT NUTS WERE FOUND TO BE LOOSE. THE GASKET BETWEEN THE PLATE AND THE ENGINE WAS THE INCORRECT ONE. CONSULT THE APPROPRIATE PARTS BOOK AND INSTALL THE CORRECT PART. PROPERLY TORQUE ALL FASTENERS TO THE CORRECT SPECIFICATIONS.