As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TWO AREAS OF CORROSION WAS FOUND ON THE UPPER SURFACE OF ANGLE ATTACHED TO THE LOWER PORTION OF THE LT WING SPAR ASSY, AT WING STATIONS 41.00 & 47.50. AREAS OF CORROSION APPEARED TO HAVE STARTED INSIDE THE MATERIAL OF THE ANGLE WITH NO EXTERNAL INFLUENCE.