As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI AFT CABIN TEMP FWD CABINE TEMP FLT DECK TEMP EICAS MESSAGE APPEARED, AC RETURNED TO GATE (BTB), MTX GROUNDED AC. T/S SYSTEM, FOUND CABIN ZONE TEMP CONTROLLER FAULTED. REMOVED AND REPLACED CABIN ZONE TEMP CONTROLLER IAW B767 AMM 21-61-03. SYSTEM OPS CHECK NORMAL. AIRCRAFT RETURNED TO SERVICE. AIRCRAFT REMAINS NON-ETOPS.