As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAXI OUT, AFT, FWD, FLT DECK CABIN TEMP EICAS MSG ILLUMINATED. A/C RETURNED TO BLOCKS (BTB). MAINTENANCE REMOVED AND REPLACED TEMP CONTROL ASSY. IAW AMM 21-57-14. OPS CKECK GOOD IAW 21-51-00. NO FAULTS DEFECTS AT THIS TIME. A/C REMAINS NO ETOPS AND RETURNED TO SERVICE.