What was found
DFW - FLT 868 - EN ROUTE DFW-BOS, DURING CLIMB-OUT, LEFT SIDE HYDRAULIC SYSTEM FAILED. DECLARED EMERGENCY, ACCOMPLISHED ALTERNATE GEAR EXTENSION, RETURNED DFW AND LANDED WITHOUT INCIDENT. REPLACED LEFT SIDE MLG DOWN LOCK ACTUATOR PRESSURE HOSE ASSY. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)