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 ON GROUND. RAN QRH PROCEDURES. LIGHT WENT OUT. GROUNDED - YES. INFO NOTED BY MAINTENANCE. PERFORMED WINDOW HEAT OPERATIONAL TEST PER B737-9 AMM 30-41-00 NOTING CORRECT OPERATION/INDICATIONS. ETOPS GROUND VERIFICATION SUCCESSFUL, SEAMC LANCE NOTIFIED.