As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING MAINTENANCE BASE CHECK FOUND THE RIGHT 21 STRINGER TO BE CORRODED BETWEEN FRAME 12 AND FRAME 13. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND INSTALLED NEW STRINGER 21R BETWEEN FRAME 12 AND FRAME 13 IAW SRM 51-40-02. THE AIRCRAFT WAS RETURNED TO SERVICE.