What was found
(CAN) DURING GROUND HANDLING, MAINTENANCE DISCOVERED A SIGNIFICANT FUEL LEAK ON THE RT WING. FUEL WAS RUNNING DOWN THE OB FLAP CANOE AND DRIPPING ONTO GROUND. AIRCRAFT WAS REMOVED FROM SERVICE AND PLACED INTO HANGAR FOR FURTHER INSPECTION AND FUEL DRAINING. AFTER OPENING THE WING TO LOCATE THE SOURCE OF THE LEAK, IT WAS DISCOVERED THAT THERE WAS A PUNCTURE HOLE IN THE HOUSING/BOX THAT THE SUPPORT ARMS FOR THE LEADING EDGE SLAT RUN INTO WHEN THE SLATS ARE RETRACTED. THIS HOLE ALLOWED FUEL TO EXIT THE FUEL TANK AND RUN UNDER THE WING. THIS IS CURRENTLY UNDER INVESTIGATION AND AN UPDATE WILL BE PROVIDED LATER.