What was found
(CAN) THE NR2 ENGINE OIL PRESSURE WARNING LIGHT ILLUMINATED WITH A CORRESPONDING FALLING OIL PRESSURE GAUGE READING. USING QRH PROCEDURES THE NR2 ENGINE WAS SHUT DOWN AND A PAN DECLARED. THE CREW THEN RETURNED THE AIRCRAFT TO BASE WHERE A SINGLE ENGINE APPROACH AND LANDING WAS CARRIED OUT WITHOUT INCIDENT. A LARGE QUANTITY OF ENGINE OIL LOSS WAS IDENTIFIED ON THE ENGINE AND ENGINEERING INVESTIGATION REVEALED A RUPTURE, FAILURE OF THE OB ENGINE OIL TANK TO OIL COOLER FLEXIBLE HOSE ASSEMBLY. THE FAILED HOSE ASSEMBLY WAS REPLACED AND FOLLOWING SATISFACTORY COMPLETION OF REQUIRED MAINTENANCE CHECKS THE AIRCRAFT WAS RELEASED BACK TO SERVICE WITHOUT FURTHER INCIDENT.