What was found
(CAN) AC EXPERIENCED A COMMANDED IFSD DUE TO OIL PRESSURE LOSS DURING CRUISE. DURING FLIGHT, PILOT NOTICED OIL PRESSURE DECREASING STEADILY DURING CRUISE. AT 36 PSI OIL PRESSURE, PILOT INITIATED A COMMANDED SHUTDOWN OF THE NR 2 ENGINE AND DIVERTED INTO BILLINGS FOR AN UNEVENTFUL SINGLE ENGINE LANDING. UPON INSPECTION OF ENGINE, MECHANICS NOTICED A STATIC OIL LEAK FROM THE BOTTOM OF GEARBOX. AFTER FURTHER INSPECTION, IT WAS NOTICED THAT THE BRACKET HOLDING THE HYD LINE TO GEARBOX AT 6:30 ON THE AFT AGB FLANGE HAD BROKEN OFF, AND CONTACTED THE BOTTOM OF THE GEARBOX JUST ABOVE THE BRACKET LOCATION, HAD WORN A HOLE IN THE AGB HOUSING, RESULTING IN THE OIL LOSS. ENGINE IS BEING REMOVED AND REPLACED, ANOTHER ENGINE