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 LIGHT ILLUMINATED, WILL NOT EXTINGUISH AFTER ALLOWING TIME TO COOL. ACFT GROUNDED. FOUND WINDOW SENSOR FAULT ON CONTROLLER FOR L1 WINDOW. SWITCHED SENSOR TO SPARE POSITION. CONFIRMED NO SENSOR FAULT, CONTROLLER TEST SUCCESSFUL. NO HISTORY 30 DAYS, REF AMM 30-41-00.