What was found
THE FLIGHT CREW REPORTED THAT THE WING HEAT CIRCUIT BREAKER WOULD TRIP WHEN STABILIZER HEAT ANTI-ICE SWITCH WAS TURNED ON. THE BASE MAINTENANCE TEAM WAS ABLE TO DUPLICATE THE C/B TRIPPING WHEN WING-STAB SWITCH ENGAGED. IT WAS SUSPECTED A RELAY, LEFT BLEED AIR OVER TEMP SWITCH DEFECTIVE AND RIGHT BYPASS VALVE DEFECTIVE. THE RELAY AND TEMP SWITCH WERE REPLACED WITH NEW UNITS. OPS CHECKS WERE SATISFACTORY AND THE AIRCRAFT WAS RETURNED TO SERVICE.