What was found
NR 3 OIL QTY INDICATION 1 QT IN FLIGHT TEMP AND PRESS. OK IN CRUISE. PRESSURE LOW ON DESCENT SHUTDOWN NR 3 ENGINE. PERFORMED VISUAL INSPECTION OF THE OIL TANK, LINES/CHIP DETECTORS. PRATT WHITNEY REP ALSO LOOKED OVER ENGINE DELTA ENGINE SHOP PERFORM GEAR BOX BOROSCOPE NO DEFECTS NOTED. OIL TANK SERVICED TO PROPER LEVEL (28 QTS ADDED). STARTS AND GROUND IDEL RUN AND LEAK CHECK AND OPS CHECKED GOOD. PRIOR TO ENGINE RUN DMI M29 FE 05-09 WAS WORKED, THE BLOCKING KIT FOR THE NR 3 ENGINE RIGHT/HYD PUMP WAS REMOVED, THE NR 3 HYDRAULIC SYSTEM WAS FLUSHED AND A OVERHAULED HYDRAULIC PUMP WAS INSTALLED. SUBMITTER STATES, THAT THE PREFORED PACKING ON THE BEVEL GEARSHAFT PLUG WAS THE SOURCE OF THE LEAK. DURING THE