As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) UPON TAKEOFF, THE CREW NOTED AN OIL PRESSURE FLUCTUATION ON THE RT ENGINE. THEY ELECTED TO SHUT IT DOWN AND AN UNEVENTFUL SINGLE ENGINE LANDING WAS MADE AT THE POINT OF DEPARTURE. POST FLIGHT INSPECTION FOUND AN OIL LEAK DUE TO DAMAGED O-RING ON THE OIL COOLER.