As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BLOCK TURN BACK, FWD EQUIPMENT VALVE EICAS MESSAGE. PERFORMED FIM 21-58 FT 898 TO STEP 42. FOUND MANIFOLD INTERCONNECT VALVE NOT CYCLING TO CLOSED POSITION. REMOVED AND REPLACED MANIFOLD INTERCONNECT VALVE IAW 21-58-01. OPS CHECK IAW POST INSTALLATION SECTION OF AMM 21-58-01-404-011.