What was found
FUEL DYE STAINS NOTICED ON UNDERSIDE OF RIGHT WING AT ROOT. CLEANED AREA AND CHECKED FOR LEAK. NO LEAK NOTED. AFTER PLANE SAT FOR 6 TO 8 HOURS, MORE FUEL STAINS NOTED. FOUND SMALL PINHOLE, .75 INCH, FROM TANK CONNECTION ON THE SOLID LINE. UPON PROBING WITH PICK, THE HOLE ENLARGED TO .0625 INCH IN DIAMETER. THE OUTSIDE OF THE LINE HAD SURFACE CORROSION AT THIS POINT WHICH PROBABLY CONTRIBUTED TO THE FORMATION OF THE HOLE.