What was found
EICAS MESSAGE FWD EQUIPMENT OVERHEAT DISPLAYED AND OVHT LIGHT ILLUMINATED. AFTER SELECTOR WAS POSITIONED TO STANDBY, LIGHT REILLUMINATED FOLLOWING 5 MINUTE DELAY AFTER SELECTOR WAS POSITIONED TO OVRD. EICAS MESSAGE FWD EQUIPMENT COOLING DISPLAYED AND NO COOLING LIGHT ILLUMINATED. DURING INSP WAS FOUND AIR LEAK ON AIR MIX MANIFOLD. GASKETS WERE FOUND DAMAGED. R & R MAIN MIX MANIFOLD GASKETS IAW SRM 51-40-02. ALSO IAW T/S WAS R & R EQUIPMENT COOLING INDICATION CARD IAW AMM 21-58-04 PG 401-404.