What was found
LEFT FWD WINDOW HEAT OVERHEAT LIGHT ILLUMINATED. GROUNDED - YES. PERFORMED BITE OF WINDOW HEAT CONTROL UNIT FOR LEFT FWD WINDOW-CAPT. WINDSHIELD REF B737-900 FIM 30-41 TASK 801. FOUND WINDOW SENSOR FAULT IN BIT TEST AND HISTORY. NO OTHER FAULTS. SWITCHED LT WINDSHIELD SENSOR TO ALTERNATE AT CAPTAIN`S WINDSHIELD BITE CHECKED GOOD. NO FAULTS AFTER SWITCHING TO ALTERNATE. OPS CHECKED GOOD. ETOPS SIGNIFICANT SYSTEM GROUND VERIFICATION SUCCESSFUL. IAW FIM 30-41 TASK 812 AND SSM 30-41-11.