What was found
(CAN) DURING TAXI, DECREASE IN HYDRAULIC FLUID QUANTITY OBSERVED. AIRCRAFT RETURNED TO RAMP. HYDRAULIC FLUID NOTICED TO BE COMING FROM RIGHT WING/ARMPIT AREA. INSPECTION REVEALED A BROKEN AND SEVERED BODY OF THE PTU CHECK VALVE AND A DISTORTED HYDRAULIC LINE (P.N. 82940010-159). BOTH ITEMS REPLACED. GROUND RUN CARRIED OUT, SYSTEMS FUNCTION CHECK AND LEAK CHECK CARRIED OUT S ATISFACTORY. AIRCRAFT RETURNED TO SERVICE.NOTE: OPERATOR FLEETWIDE CAMPAIGN IN EFFECT TO CHECK FOR DEFECTS IN ASSOCIATED PARTS. DEFECTIVE PART TO BE SENT TO MANUFACTURER FOR ANALYSIS.