As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FORWARD EQUIPMENT VALVE EICAS MESSAGE AFTER ENGINE START. PERFORMED FIM 21-58 FT 898 FOR FWD EQPT VALVE MSG AND SUSPECT MANIFOLD INTERCONNECT VALVE TO BE THE ISSUE DUE TO POSITION NOT CHANGING. REMOVED AND REPLACED MANIFOLD INTERCONNECT VALVE IAW AMM 21-58-01. OPS CHECK GOOD, NO FAULTS NOTED.A/C OK FOR SERVICE.