As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FWD EQUIPMENT VALVE, EICAS MESSAGE DISPLAYED ON TAKEOFF. WENT OFF AFTER APPROXIMATELY 10 SEC. CAME ON AGAIN AFTER LANDING. WENT OFF AFTER APPROXIMATELY 20 SEC. MANUALLY OPERATED EQUIPMENT COOLING. TEST OK. COULD NOT DUPLICATE FAULT AMM 21-58-00.