As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUND DURING INSPECTION SEVERE INTERGRANULAR CORROSION OF LT WING SPAR JUST OUTBOARD OF GEAR ATTACHMENT. REQUIRED SPAR REPLACEMENT. AIRCRAFT HAD SPENT 90 PERCENT OF ITS LIFE NEAR THE OCEAN. REMOVAL OF FUEL TANK OR CLOSE INSPECTION WITH A MIRROR AND LIGHT WILL LOCATE THIS PROBLEM. WING SPAR P/N 66601-004.