As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LH SIDE WINDOW EICAS MESSAGE ILLUMINATED ON TAXI. AIRCRAFT BACK TO BLOCK AND GROUNDED BY MAINTENANCE. MAINTENANCE DEFERRED THE L/H SIDE WINDOW HEAT IAW MEL 30-41-1-2. MAINTENANCE PROCEDURES COMPLIED WITH; PLACARD INSTALLED. AIRCRAFT REMAINS ETOPS 180. AIRCRAFT RETURNED TO SERVICE.