As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEVERE CORROSION ON LOWER CENTER SECTION SPAR CAP. CORROSION WAS FOUND AFTER RT WING WAS REMOVED FOR REPAIR DURING ANNUAL INSPECTION. CORROSION CANNOT BE DETECTED WITH WING INSTALLED. SUBMITTER RECOMMENDED PANEL BE INSTALLED ON BOTTOM SKIN PANEL TO CHECK FOR CORROSION.