As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ISN - AFTER TAKEOFF, CREW OBSERVED AN OIL PRESSURE FLUCTUATION ON THE RIGHT ENGINE. THE ENGINE WAS SHUT DOWN FOLLOWED BY AN UNEVENTFUL LANDING. MAINTENANCE FOUND AN OIL LEAK CAUSED BY A CUT O-RING. SERVICED ENGINE WITH 4 QUARTS OIL AND LEAK CHECKED OK.