As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A WING NDT INSPECTION OF THE LT WING PLANK AT FS 452 BL 33, CORROSION WAS FOUND. ENGINEERING HAS DETERMINED THIS CORROSION IS EXCESSIVE ENOUGH TO REQUIRE ACCOMPLISHMENT OF ASC 229, WHICH WILL REMOVE THE CORROSION ON THE PLANK AND INSTALL A THREE PIECE FITTING PLATE.