What was found
BLUE SYS HYD QUANTITY DECREASED IN FLIGHT SLOWLY UNTIL REACHED LO LEVEL WARNING, SECURED PUMP IAW ECAM AND QUANTITY STOPPED DECREASING, PRESSURE REMAINED ABOVE 3000 PSI UNTIL PUMP TURNED OFF. FOUND RETURN LINE TO BLUE MANIFOLD INSTALLATION SERVO CONTROL ACTUATOR LEAKING AT UNION, SEALS IN UNION DETERIORATED, REPLACED SEALS IAW AMM 29-12-34-04-0, NO LEAKS NOTED, OK FOR SERVICE. FINAL CLOSED.