As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT SIDE WINDOW HEAT ILLUMINATED DURING FLIGHT, RAN QRH WITH OVERHEAT LIGHT REILLUMINATED AFTER CHECKLIST COMPLETE. GROUNDED - YES. COULD NOT DUPLICATE MALFUNCTION. RAN WINDOW HEAT APPROX 15 MINUTES. NO DEFECTS NOTED. WHCU BITE CK NORMAL SEVERAL TIMES. WINDOW POWER LOGGED PREVIOUS FLIGHT. OP CK NORMAL. REF B737-800 FIM 30-14 TASK 814.