What was found
(CAN) A/C HAD JUST CLEARED CONTROL ZONE , WHEN THE HYDRAULIC HORN AND HYDR. LIGHT ACTIVATED, HYD ISOLATION SWITCHED OFF PROCEEDED BACK TO BASE [6 MILES] LANDED WITH HYDRAULICS OFF, WITHOUT INCIDENT. MAINTENANCE CARRIED OUT. TROUBLE SHOOTING, FOUND TO BE AN INDICATION PROBLEM ONLY. THE PRESSURE SWITCH P/N MA124-01 REMOVED (DATE OF MANUFACTURE OF FAILED PRESSURE SWITCH WAS APRIL 2009) AND A SERVICEABLE SWITCH WAS INSTALLED. A/C WAS GROUND RUN, LEAK CHECKED AND HYDR. SYSTEM TESTED. A/C RETURNED TO SERVICE. THIS WAS A CADORS (TC# 20091021015)