As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FWD WINDOW HEAT INOP LIGHT ILLUMINATED L FWD WINDOW EICAS MESSAGE. AIRCRAFT RETURNED TO BLOCK AND WAS GROUNDED BY MAINTENANCE. MAINTENANCE REMOVED AND REPLACED LEFT WINDOW HEAT CONTROLLER PER AMM 30-41-01. OPS CHECK GOOD. AIRCRAFT RETURNED TO SERVICE