As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING SCHEDULED MAINTENANCE FOUND THE BAGGAGE DOOR CUTOUT FORWARD LOWER CORNER CORRODED AT NUT PLATE FOR TRIM. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED RIB DUE TO OUT OF LIMIT CORROSION. LOCATED & DRILLED NEW RIB IAW SRM 51-40-02. THE AIRCRAFT WAS RETURNED TO SERVICE.