What was found
DFW - FLT 2342 - EN ROUTE DFW-ORD, AFTER TAKEOFF GEAR HANDLE PUT IN RETRACT POSITION 'C' HYDRAULIC PRESSURE DROPPED TO 710 PSI AND BOTH ELECTRICAL PUMP INOPERATIVE LIGHTS ILLUMINATED. AIRCRAFT RETURNED DFW LANDING WITHOUT INCIDENT. AIRCRAFT REMOVED AND FROM SERVICE FOR FURTHER EVALUATION. DFW MAINTENANCE REPLACED THE AIR DRIVEN PUMP AND PRESSURE REGULATOR SHUTOFF VALVE PER MM. ALL OPERATIONAL CHECKS NORMAL. SYSTEM GROUND CHECK OPERATION NORMAL. (M)