As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
L1 WINDOW HEAT EICAS MESSAGE. AIRCRAFT DIVERTED TO CVG AND GROUNDED BY MAINTENANCE. MAINTENANCE C/W FIM 30-41 FT 803 NO DEFECTS NOTED PERFORMED RESISTANCE CHECK ON L1 WINDOW. NO DEFECTS FOUND. RANG OUT WIRING FROM L1 WINDOW TO WHCU. IAW FIM 30-41- FT 801. MAINTENANCE REMOVED AND REPLACED L1 WINDOW IAW AMM 56-11-01. AIRCRAFT RETURNED TO SERVICE.