As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING 12 YEAR CORROSION INSPECTION OF CENTER WING FUEL TANK, CORROSION WAS DISCOVERED WHICH REQUIRED EXCESSIVE REMOVAL OF MATERIAL FROM CENTER TANK LOWER SKIN. DASSAULT ENGINEERING WAS CONTACTED AND PROVIDED CHANGE APPROVAL SHEET R247. THINNED AREA WAS REPAIRED BY INSTALLING AN EXTERNAL DOUBLER PER ABOVE MENTIONED DOCUMENT. (M)