As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ANNUAL INSPECTION OF THE CARRY THROUGH SPARS, INTER GRANULAR CORROSION WAS FOUND IN THE BOTTOM WEB OF THE AFT SPAR, NONE FOUND IN THE FORWARD SPAR. PROBABLE CAUSE WAS IN MANUFACTURING. RECOMMEND CONTINUED INSPECTION OF OLD SPARS.