As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TYS - A/C CURRENTLY IN A C-CHECK STATUS WHEN INSPECTION FOUND THE LT FLOOR SILL PITTED AT FR18 THRU FR 20. MAINTENANCE REMOVED AND REPLACED THE FLOOR SILL IAW EMB 135/145 SRM-51-40-02. ALL WORK WAS ACCOMPLISHED AND WILL BE RELEASED AT THE END OF THE CHECK.