What was found
EICAS MSG FWD EQPT VAL DISPLAYED.EQUIPMENT COOLING ''VALVE'' LIGHT ILLUMINATED. STBY SELECTED & VALVE LIGHT REMAINED. DUMPED 35.8 FUEL. DIVERTED MIA SUPPLEMENTAL DATA UPDATE RELAY K1043 AIR/GROUND WAS FOUND STUCK IN THE GROUND POSITION. WHEN RELAY WAS REMOVED AND REINSTALLED THE SYSTEM OPERATED NORMALLY. RELAY K1043 WAS REPLACED. RELAY K1188 AIR/GROUND IND SLAVE WAS REPLACED PRECAUTIONARY. THE AIRCRAFT DEVELOPED A DIFFERENT FAULT ONE WEEK LATER. THIS FAULT WAS CORRECTED BY REPLACING THE OVERBOARD EXHAUST VALVE.