What was found
DURING ENGINE START, AN EICAS MESSAGE FOR FWD EQUIPMENT COOLING DISPLAYED AND THE EQUIPMENT COOLING VALVE LIGHT ILLUMINATED AND THE FORWARD EQUIPMENT COOLING EXHAUST FAN CIRCUIT BREAKER TRIPPED OPEN. A STRONG ELECTRICAL BURNING ODOR WAS OBSERVED. THE AIRPLANE WAS REMOVED FROM SERVICE. THE CAUSE OF THE EICAS MESSAGE WAS A FAULTY FORWARD EQUIPMENT COOLING EXHAUST FAN. THE EQUIPMENT COOLING EXHAUST FAN WAS REPLACED. THE CAUSE OF THE BURNING ODOR WAS NOT DETERMINED.