What was found
(CAN) THE ENGINE COWLS WERE REMOVED FOR 150 HOUR INSPECTION AND A SMALL AMOUNT OF FUEL WAS FOUND IN THE BOTTOM RIGHT COWL. WHEN THE RT FUEL BOOST PUMP WAS TURNED ON TO LOCATE THE SOURCE FUEL WAS OBSERVED DRIPPING AT ABOUT 1 DROP PER 2 SECONDSFROM THE RT ENGINE FIREWALL SHUTOFF VALVE. THE LEAK WAS FROM THE ACTUATOR END NOT THE MAIN BODY. FAA AD 2003-17-03 HAD BEEN COMLIED WITH THE VALVE HAD BEEN MODIFIED AS PER ELECTROMECH SB 484-3AB.