What was found
(CAN) AFTER COMPLETION OF UNLOADING FREIGHT, OUR AIRCRAFT WAS REPOSITIONING TO THE MAINTENANCE FACILITY AT FBO. DURING ENGINE SHUTDOWN, AN ENGINEER FROM OUR CONTRACTED AMO NOTICED FUEL LEAKING FROM THE RIGHT ENGINE LOWER COWLING. IN ORDER TO STOP THE FUEL FROM LEAKING, THE RIGHT ENGINE EMERGENCY SHUT DOWN LEVER WAS PULLED.AFTER VISUAL INSPECTION, A SMALL HOLE ON THE FCU BOOST PUMP CASTING WAS OBSERVED.THE SMALL HOLE SEEMS TO ORIGINATE FROM A DEFECT IN THE CASTING.