As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE OPENING SOME SKIN LAPS TO TREAT SURFACE CORROSION THE LT SIDE OF THE MAIN SPAR ABOUT 2.5 FEET FROM TIP WAS FOUND TO HAVE SEVERE INTERGRANULAR CORROSION TO THE POINT WHERE A 4-5 INCH LONGITUDNAL CRACK ABOUT .2500 INCH WIDE WAS FOUND. PART WAS SCRAPPED AND REPLACED WITH NEW ASSY, TREATED AC WITH ACF50. (K)