As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT FWD WINDOW HEAT OVERHEAT ILLUMINATED. GROUNDED-YES. PERFORMED BITE TEST OF WHCU, REF B737-900 FIM 30-41 TASK 801. FOUND LT FWD WINDOW SENSOR FAULT. ACTIVATED OVERRIDE MODE ON WHCU. OVERHEAT LIGHT IS OUT AND OPERATES NORMAL, REF FIM 30-41 TASK 812 AND B737-900 AMM 30-41-11.