What was found
AFTER T/O "NR1 HYD LOW" ALERT APPEARED WITH FLUID DECREASING THEN HYD FAIL ALERT IN NR1. FLUID QUANTITY INDICATED 0. FOUND CRACKED UNION NR 1 HYD RETURN LINE, PERFORMED REPAIR IAW AMM 20-10-01. REMOVED AND REPLACED NR 1 ENGINE MANIFOLD FILTERS IAW MM 29-12-41-2. REPLACED NR 1 ENGINE LEFT AND RIGHT HYDRAULIC PUMPS IAW MM 29-11-20-4-2. SERVICED HYDRAULIC SYSTEM IAW MM 29-11-20. BOTH HYDRAULIC PUMPS, FILTER MANIFOLD AND SLAT REPAIR LEAK CHECKED GOOD. INSTALLED SLAT PANEL IAW MM 57-40-01-4. OK FOR SERVICE.