What was found
(CAN) WHILE THE ACFT WAS ON THE GROUND, FLIGHT CREW NOTED A HYDRAULIC LEAK CLOSE TO THE RT NOSE WHEEL. NR 2 HYD QTY WAS OBSERVED TO BE 47 PERCENT. MAINTENANCE DETERMINED THAT THE STEERING MANIFOLD PRESSURE LINE SWIVEL JOINT WAS LOOSE. THE SWIVEL JOINT WAS RESECURED AND THE O-RING WAS REPLACED. A FUNCTION CHECK WAS CARRIED OUT ON THE NOSE WHEEL STEERING SYSTEM AND THE ACFT WAS SUBSEQUENTLY RETURNED TO SERVICE.