As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT SIDE WINDOW OVERHEAT LIGHT ILLUMINATED ON DOWNWIND INFLIGHT INTO SEATTLE. GROUNDED-YES. FOUND LEFT SIDE WINDOW POWER CORD AT SIDEWALL NOT FULLY LOCKED, SECURED CONNECTOR. ACCOMPLISHED WINDOW HEAT CONTROL UNIT BITE, REF B737-800 FIM 30-41 TASK 801. BITE VERIFY PASSES. FAULT HISTORY HAD "WINDOW POWER" FAULTS. RESET LEFT SIDE WHCU AND ERASED FAULTS.