What was found
(CAN) DISCOVERED FAULT WAS WITH MLG HYD SYS PRESSURE SWITCH. REPLACED DUE TO LEAK FROM ACCUMULATOR SIDE OF HYD SYS THROUGH A VENT HOLE IN SIDE OF BODY OF SWITCH. THIS DEPLETES NITROGEN IN ACCUMULATOR, WITH LESS AIR IN ACCUMULATOR, LANDING GEAR HYDR SYS MOTOR/PUMP WOULD RUN CONSTANTLY. PRESSURE SWITCH CONTROLS RELAY THAT CONTROLS HYD MOTOR/PUMP OPERATION. RELAY'S OTHER CONTACTS CONTROL HYD INTERLOCK RELAY TO PREVENT OPERATION OF VAPOR CYCLE COOLING SYS & LANDING GEAR HYDR SYS FROM OPERATING AT SAME TIME. NO INDICTION OF ANY DEFECT WITH LANDING GEAR SYS ,NO WARNING LIGHTS IN COCKPIT. UPON REPLACEMENT OF PRESSURE SWITCH AND LANDING GEAR HYD SYS RESERVICING ALL SYSTEMS OPERATED NORMALLY.