As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT SIDE WINDOW HEAT OVERHEAT LIGHT ILLUMINATED ON FINAL APPROACH. TURNED SWITCH OFF AND LIGHT WENT OFF. GROUNDED - YES. PER B737-800 FIM 30-41 TASK 801 WHCU BITE HAS A SENSOR FAULT IN HISTORY. BIT TEST PASSED. OPS CHECK GOOD. FAULT NOT ACTIVE AT THIS TIME.