What was found
(CAN) IN-FLIGHT SHUTDOWN OF NR 2 ENGINE DUE TO OIL PRESSURE FLUCTUATION. AIRCRAFT WAS ENROUTE WHEN THE EVENT OCCURRED, AT WHICH AN EMERGENCY WAS DECLARED AND THE AIRCRAFT HAD TO COMPLETE AN UNSCHEDULED LANDING. AFTER LANDING INSPECTION, AIR CREW REPORTED AN EXCESSIVE AMOUNT OF OIL AROUND LOWER AFT NACELLE AREA, INDICATING A POSSIBLE OIL LEAK AROUND THE OIL COOLER AREA. BORESCOPE INSPECTION SHOWED DAMAGED HP IMPELLER . ENGINE MUST BE REPLACED.