What was found
(CAN) AIRCRAFT HAS RECEIVED A REPORT WHICH WE FEEL IS A REPORTABLE EVENT. WHILE IN CRUISE, THE FLIGHT CREW FELT VIBRATION AND NR 2 ENGINE VIBRATION WAS FLUCTUATING BUT WAS WITHIN LIMITS. AFTER A FEW SECONDS, OIL PRESSURE DROPED TO ZERO. THE CREW FOLLOWED THE QRH, AN EMERGENCY WAS DECLARED, NR 2 ENGINE WAS SHUT DOWN, AIRCRAFT DIVERTED AND LANDED WITHOUT FURTHER INCIDENT. ENGINE REMOVED AND REPLACED. AIRCRAFT RETURNED TO SERVICE.