What was found
(CAN) A/C DEPARTED AND TURNED AROUND AFTER NOTICING SLOW STEADY DECLINE IN CENTER SYSTEM QUANTITY. MAINTENANCE FOUND FLUID LEAKING FROM FUSELAGE DRAIN HOLES IN THS COMPARTMENT. UPON INVESTIGATION MAINTENANCE FOUND CENTER SYSTEM HYD MOTOR ON THIS GEARBOX LEAKING FLUID OUT MOTOR DRAIN LINE BUT MOST WAS COMING OUT THS GEAR BOX VENT HOLE ON FWD SIDE OF GEARBOX POSSIBLY DUE TO A PARTIALLY BLOCKED MOTOR DRAIN LINE. MFG INDICATED THAT WE WILL HAVE TO REPLACE THE THS ACTUATOR DUE TO THE HYDRAULIC FLUID LEAKAGE CONTAMINATING THE ACTUATOR GEAR BOX.