As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI OUT AND ENGINE START, AFT FWD CABIN AND FLIGHT DECK TEMP MESSAGES. AFTER PUSH BACK AND ENGINE START. A/C RETURNED TO GATE (BTB) AND MTX GROUNDED A/C . MTX RESET ZONE TEMP CONTROLLER IAW AMM 21-61-03. MESSAGES CLEARED. OPS CHECK GOOD. A/C OK FOR SERVICE. A/C REMAINS ETOPS 120.