As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON REMOVAL OF THE LT WING FUEL TANK FOR REPLACEMENT OF FUEL VENT HOSES, CORROSION WAS NOTED AT THE OUTBOARD SIDE FALSE RIB (NOSE RIB) SECTION OF THE FUEL TANK. THE CORROSION WAS BLISTERED. AFTER PROBING WITH THE POINT OF A METAL SCRIBE, IT WAS FOUND THE METAL COULD BE PENETRATED WITH LIGHT HAND PRESSURE. THERE WAS NO EVIDENCE OF FUEL LEAKAGE.