What was found
AT CRUISE FL 340 GOT (HYD 3 ELEV OFF) LEVEL 1 ALERT. NR 3 QTY DECREASED SLOWLY TO 3.2 GAL. THEN GOT (HYD 3 OFF) LEVEL 1 ALERT. PUMPS TURNED OFF AND QUANTY STABILIZED AT 3.6. AFTER SLATS EXTENDED AND GEAR EXTENDED, QUANTITY DECREASED TO 1.2. COMPLIED WITH CFM. DIVERTED. REMOVED AND REPLACED NR 3 ENG UPPER EDP AND LOWER EDP PER MM 29-11-20.HYD LINES REQ BLEED AND LEAK CHECK AND OPS CHECK OF EDP'S AND COWLS SECURED CLOSED REMOVED AND REPLACED RESERVOIR PER MM29-12-01-4 MOTORED NR 3 ENG TO BLEED AND LEAK CHECK UPPER AND LOWER EDP'S, RAN NR 3 ENG TO OPS CHECK EDP'S PER JRH AND MD11 MM 29-11-00-0, ALL PARAMETERS MET. A/C OK FOR SERVICE.