What was found
DURING APPROACH AFTER GEAR DOWN SELECTION, THE FLIGHT CREW OBSERVED NR 2 HYDRAULIC ISOLATION VALVE CAUTION LIGHT ILLUMINATED, HYDRAULIC PRESSURE INDICATING 3000 PSI, AND QUANTITY DROPPING. LANDING GEAR CONFIRMED DOWN AND LOCKED. FLIGHT CREW CARRIED OUT EMERGENCY PROCEDURES AND AIRCRAFT LANDED UNEVENTFULLY. MAINTENANCE DISCOVERED HYDRAULIC FLUID LEAK FROM MAIN LANDING GEAR DOWN LOCK RELEASE ACTUATOR. HYDRAULIC LINE REPLACED AND HYDRAULIC SYSTEM FLUSHED. AIRCRAFT RETURNED TO SERVICE. VENDOR FOR FLEX LINE IS GOODRICH.