What was found
(CAN) THE PILOT NOTICED THE NR1 HYDRAULIC SIDE RESEVOIR WAS NEARLY EMPTY ON SHUTDOWN AND HYDRAULIC FLUID LEAKING ON SPOT. MAINTENANCE WAS NOTIFIED. UPON INVESTIGATION, A LEAK WAS FOUND ON THE HYDRAULIC PIPE, BETWEEN THE 3 WAY CHECK VALVE AND THE INTEGRATED VALVE ASSY ON THE NR 1 HYDRAULIC SYS. THE LEAK WAS COMING FROM THE PIPE END FITTING CONNECTION WHERE IT MEETS THE 3 WAY CHECK VALVE. THE PIPE WAS REPLACED WITH A NEW PIPE AND GROUND RUN LEAK CHECK CARRIED OUT. NO LEAK DETECTED AND THE ACFT WAS RETURNED TO SERVICE.