As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING AN ANNUAL INSPECTION OF AIRCRAFT, NOTED THE REAR SPAR UPPER AFT CAP HAD CORROSION THAT APPEARED TO BE INTERGRANULAR FROM WS 85.0 TO WS 111.5 (APPROX) LEFT WING. AIRCRAFT FERRIED TO ANOTHER FACILITY FOR EVALUATION AND POSSIBLE REPAIR.