What was found
NR 1 HYDAULIC FLUID AND PRESSURE LOSS AFTER GEAR RETRACTION, POSITION ADP OFF AND EDP TO DEPRESSURE PER QRH. HYD OVERHEAT LIGHT ON, 1 GALLON FLUID REMAINING. FOUND NR 1 ENGINE ADP PRESSURE LINE WITH CRACKED UNION FITTING. REMOVED AND REPLACED UNION IAW B747 MM 20-11-21. PERFORMED HYD FLUSHING AND FILTER REPLACEMENT IAW B747 MM 29-11-00 CONDITION NR 3. NO EVIDENCE OF ADP OR EDP OVERTEMP OR DETERIORATION, REPLACED PRESSURE AND CASE FILTERS IAW MM 29-11-18 AND 29-11-23. LEAK CHECK GOOD.