As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING MAINTENANCE INSPECTION FOUND STRINGER 21 RIGHT BETWEEN FRAMES 12 AND 13 CORRODED. THE AIRCRAFT WAS REMOVED FROM SERVICE. REPAIRED COMPLETED IAW EO EM-53MR-2109. LEVEL OF CORROSION NOT SPECIFIED. THE AIRCRAFT WAS RETURNED TO SERVICE.