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 LEFT FLOOR SILLS FROM FRAME 19A TO FRAME 36 CORRODED BEYOND MFG'S LIMITS. MAINTENANCE REMOVED AND REPLACED THE FLOOR SILLS IAW EMB 145 SRM 51-40-02. ALL WORK WAS ACCOMPLISHED AND WILL BE RELEASED AT THE END OF THE CHECK.