What was found
(CAN) DURING A 'B' CHECK INSPECTION, A HYDRAULIC SYSTEM FUNCTION CHECK WAS BEING COMPLETED. A LEAK WAS DETECTED AT THE AUX HYDRAULIC RETURN LINE LOCATED IN THE FORWARD SKI SLOPE OF THE AIRCRAFT. UPON INVESTIGATION A CRACK WAS FOUND WITH A PIECE OF THE LINE MISSING FROM THE CRACKED AREA. THE DIMENSION OF THE MISSING PIECE IS APPROXIMATELY 1/4 X 1/16 INCH. THE HYDRAULIC TANK WAS REMOVED FROM THE AIRCRAFT AND INSPECTED INSIDE FOR SIGNS OF CONTAMINATION. THE TANK WAS FLUSHED AND REINSTALLED IN THE AIRCRAFT.THE LINE WAS REPLACED WITH A SERVICEABLE UNIT AND A LEAK CHECK OF THE SYSTEM WAS COMPLETED.