As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FWD EQUIP VALVE EICAS MSG ON TAXI OUT. RAN QRH WITH NO RESET. TAXIED BACK TO GATE(<P>TRANSFERRED TO MDDR 127574 IAW DDG 21-58-41-01, CAT C.<BR /></P><P>REF LOG PAGE 1150487 ITEM M9; REMOVED AND REPLACED FLIGHT COMPARTMENT DUCT AIR TEMP SENSOR IAW AMM 21-61-02. ALL OPS CHECK GOOD AT THIS TIME. THIS CLEARS MDDR 127574.</P>)