As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING B INSPECTION FOUND THE LEFT NR 1 FLOOR SILL CORRODED BETWEEN FRAMES 19-20. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE LEFT NR 1 FLOOR SILL IAW EMB SRM 51-40-02 AND 51-20-03. THE AIRCRAFT WAS RETURNED TO SERVICE.