As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TWO AREAS OF EXFOLIATION CORROSION WERE FOUND ON THE UPPER SURFACE OF ANGLE, WHICH IS ATTACHED TO THE LOWER PORTION OF THE PN 86152-00 LT WING SPAR ASSY, AT APPROXIMATELY WING STATIONS 41.00 & 47.50. DUE TO THE AMOUNT OF MATERAIL REQUIRED TO BE REMOVED THESE AREAS OF CORROSION APPEARED TO HAVE STARTED INSIDE THE MATERIAL OF THE ANGLE WITH NO EXTERNAL INFLUENCE.