As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT #2 WINDOW HEAT OVERHEAT LIGHT ILLUMINATED. GROUNDED - YES. PERFORMED B737-800 FIM 30-41 TASK 814 NO FAULTS ON WHCU-LRU SENSORS ARE WITHIN LIMITS. OPS CHECKS GOOD WINDOW HEATS AND MAINTAINS APPROPRIATE HEAT. REF B737-800 AMM 30-41-00-710-801.