What was found
WHILE IN CRUISE FLIGHT, CREW NOTICED THE NR 1 HYDRAULIC QUANTITY READ ZERO. PRESSURE REMAINED NORMAL. WHEN FLAPS WERE SELECTED UP, THE SPOILER CAUTION LIGHT ILLUMINATED. INSPECTED AND FOUND HYDRAULIC LINE AT THE RIGHT INBOARD ROLL SPOILER FAILED. INSTALLED FLEXIBLE LINE PER DHC STANDARD PRACTICES. SYSTEM SERVICED AND BLED LEAK AND OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE. (M)