As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI OUT, AFTER L ENG START EICAS MESSAGE L ENG ANTI-ICE VALVE ILLUMINATED. AIRCRAFT RETURNED TO BLOCKS (BTB). REMOVED AND REPLACED L ENG TAI VALVE IAW AMM 30-21-03. OPS CHECK GOOD. NO DEFECTS NOTED AT THIS TIME. A/C REMAINS ETOPS 180. AIRCRAFT RETURNED TO SERVICE.