What was found
HYD 3 FAILED WHILE AIRBORNE, 1 HR AT FL360 AT BLOCK IN, FOUND HYD FLUID COMING OUT OF NR 3 ENGINE. OPENED THE NR 3 ENGINE COWLINGS AND THRUST REVERSER IAW AMM 71-10-00-2-1. FOUND LEAK COMING FROM CASE DRAIN FILTER TO PYLON HOSE. FOUND CASE DRAIN HOSE CRACKED ON RIGID END OF LINE AT THE BEND CLOSE TO THE B-NUT. REPLACED THE NR 3 RT ENGINE HYDRAULIC PUMP IAW AMM 29-11-20-4-2. REPLACED THE LT AND RT ENGINE HYD PUMP FILTERS IAW AMM 29-12-41-2. R & R NR 3 ENGINE UPPER ENGINE HYD PUMP. DRY MOTORED ENGINE. NO LEAKS NOTED ON LT AND RT PUMP, ON THE HYD LINE AND ON THE FILTERS. RAN NR 3 ENGINE. ALL OPERATIONS AND INDICATIONS FOR NR 3 HYD SYSTEM CHECKED GOOD. NO LEAKS NOTED IAW MM 29-11-20-4-2 AND JRH.