What was found
BOS - FLT 1201 - EN ROUTE BOS-DFW, DURING CLIMB-OUT, RIGHT HYDRAULIC PRESSURE LOW LIGHT ILLUMINATED. RIGHT HYDRAULIC SYSTEM HAD TOTAL LOSS OF FLUID, UNABLE TO RETRACT LANDING GEAR. RETURNED BOS AND LANDED WITHOUT INCIDENT. REPLACED ANTI-SKID CONTROL VALVE. REPLACED RIGHT ENGINE DRIVEN HYDRAULIC PUMP AND ELECT HYDRAULIC PUMP AS PRECAUTIONARY. REPLACED RIGHT ENGINE AND RIGHT HYDRAULIC SYSTEM FILTERS. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)