As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER TAKEOFF, THE RIGHT ENGINE OIL PRESSURE WAS FLUCTUATING RAPIDLY 55-42 PSI. THE PILOT DECLARED EMERGENCY, THE LANDING WAS UNEVENTFUL. MAINTENANCE CONTROL REPLACED THE RT ENGINE (THE EXACT CAUSE IS NOT KNOWN) (S/N OFF: 807100/S/N ON: 807432).