What was found
RT WINDOW HEAT CAUTION MESSAGE. CYCLED PER CHECKLIST, CAUTION WENT OFF. AFTER 10 MIN MESSAGE CAME BACK. F/O WINDOW FEELS COLD. MX PLACED ON MEL 30-41-1(A), RSI 352674. C/W STEP 1 OF EA R-56-17 BY CHANGING ELEMENT TO SPARE. PERFORMED OPS CHECK OF WINDOW, STILL COLD, MEL CONTINUED. PERFORMED RESISTANCE CHECK OF ALL 3 SENSING ELEMENTS AND HEATER ON RT WINDSHIELD. NO DEFECTS NOTED. PERFORMED RESISTANCE AND MEGGER CHECKS OF RT WINDSHIELD WIRES, NO DEFECTS NOTED. REPLACED RT WINDSHIELD TEMPERATURE CONTROLLER IAW TASK 30-41-06-000-801-A01 & 30-41-06-400-801-A01 AS A PRECAUTION. OPERATIONAL CHECKS GOOD. MEL CLEARED AND WIRES RECONNECTED TO PRIMARY ELEMENT. AIRCRAFT RETURNED TO SERVICE.