What was found
BOI- NR 2 ISOLATION SHUTOFF VALVE LIGHT 50 MINUTES INTO FLIGHT, 30 SECONDS LATER NR 1 ISOLATION SHUTOFF VALVE CAUTION LIGHT WITH INBOARD SPOILER LIGHT, BOTH HYDRAULIC QUANTITY. RETURNED TO BOI AND PERFORMED NO FLAP LANDING WITHOUT EMERGENCY BRAKES. LANDED WITHOUT INCIDENT. INSPECTED AND FOUND NR 1 BRAKE LEAKING AT LOWER PUCK ASSEMBLY. REMOVED AND REPLACED BRAKE ASSEMBLY AND SERVICED HYDRAULIC SYSTEM. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.