As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING MAJOR AIRFRAME REPAIR WITH WINGS OFF, INSPECTION OF THE WING ATTACH FITTINGS REVEALED BOTH LEFT AND RIGHT UPPER MAIN SPAR FITTINGS HAD INTERGRANULAR CORROSION AT THE POINT WHERE THE FITTINGS CAME OUT OF THE FUSELAGE SPAR ASSEMBLY. THERE WAS NO APPARENT CONTAMINATION OF THE AREA SUCH AS PAINT STRIPPER, ETC. BOTH FITTINGS WERE REPLACED WITH NEW PARTS.