What was found
IN FLIGHT WE NOTICED HYD A QTY WAS DROPING, IT DROPPED TO 71 PERCENT. ACCORDING TO CAPT HYDRAULIC QUANTITY DROPED ON CRUISE AND CAME BACK UP , ON GROUND HYDRAULIC QUANTIY 96 OPERATED HYDRAULIC AND ALL FLIGHT CONTROL AND FLAP NO SIGN OF ANY LEAKAGE FOUND PERFORMED 29-30 TASK 815 FOUND NO FAULTS. CORRECTION FIM 29-30 TASK 815 PER FTD 737NG-FTD-29-01003, A SYS HYD RESERVOIR NORMALLY DROPS 20% WHEN THE GEAR IS RETRACTED.PERFORMED HYDRAULIC SYSTEM A LEAK CHECK IN REFERENCE TO TASK 29-00-00-790-801-C4. NO LEAKS NOTED AND HYDRAULIC QUANTITY NEVER DROPPED.