As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER ENGINE START WE GOT AN FLT DECK TEMP EICAS RAN THROGH ABNORMAL AND COULD NOT CONTROL HEAT. AIRCRAFT BACK TO BLOCK AND GROUNDED BY MAINTENANCE. MAINTENANCE REMOVED & REPLACED ZONE TRIM AIR VALVE (V!) IAW AMM 21-61-07 AND ZONE TEMP CONTROLLER IAW AMM 21-61-03. AIRCRAFT BACK TO BLOCK AND GROUNDED BY MAINTENANCE. MAINTENANCE REMOVED & REPLACED ZONE TRIM AIR VALVE (V!) IAW AMM 21-61-07. AIRCRAFT RETURNED TO SERVICE.