As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) 15 MINUTES INTO THE FLT, THE RT ENGINE OIL PRESSURE BEGAN TO FLUCTUATE BETWEEN 25 & 33 PSI FOR FIVE MINUTES (STABLE OIL TEMPERATURE WAS NOTED). THE OIL PRESSURE SLOWLY BEGAN TO DECREASE BELOW 25 PSI, WHEREBY THE FLIGHT CREW INITIATED AN IN-FLIGHT SHUT DOWN. MAINTENANCE ATTRIBUTED THE OIL PRESSURE FLUCTUATION TO HYD EDP CARBON SEAL MOUNTED ON THE ACCESSORY GEAR BOX. THE AIRCRAFT RETURNEDTO SERVICE FOLLOWING THE SEAL REPLACEMENT.