What was found
NOTICED STEADY LEAK IN HYDRAULIC SYSTEM NR 3. SHUTOFF SYSTEM NR 3 PUMPS, QUANTITY CONTINUED TO GO DOWN TO 0.0 GALLONS. HYDRAULIC NR 3 FAIL ALERT ILLUMINATED. COMPLIED WITH CHECKLIST, UNEVENTFUL LANDING AND ROLLOUT. FOUND FLUID LEAKING FROM NR 3 LEFT HAND ENGINE DRIVEN HYDRAULIC PUMP CASE RETURN LINE. REMOVED AND REPLACED THE LINE. ALSO, REPLACED HYDRAULIC FILTERS. RAN ENGINE AND OPERATIONAL CHECK GOOD.