What was found
DURING CRUISE, WITH EQUIPMENT COOLING SWITCH IN STANBY, EICAS MESSAGE " FWD EQPT OVHT" DISPLAYED AND OVERHEAT LIGHT ILLUMINATING. IAW AMM TASK CARD 21-58-29-004-001 R & R DIFFERENTIAL PRESSURE SWITCH. R & R EQUIPMENT COOLING INDICATION CONTROL IAW AMM 21-58-24. TESTED OK. DURING APPROACH WITH EQUIPMENT COOLING SWITCH OVERRIDE, EICAS MESSAGE "FWD EQPT COOLING" DISPLAYED AND NO COOLING LIGHT ILLUMINATED. R & R EQUIPMENT COOLING LOW FLOW DETECTOR IAW AMM 21-58-17. OPS CHECKED OK. EICAS MESSAGE "FWD EQPT VALVE DISPLAYED EQUIPMENT COOLING VALVE LIGHT ILLUMINATED, STANBY SELECTED AND VALVE LIGHT REMAINS ILLUMINATED. R & R OVERBOARD EXHAUST VALVE IAW AMM 21-58-05, OPS TESTED SATISFACTORY.