As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TYS - A/C IN C-CHECK WHEN INSPECTION FOUND THE LEFT FLOOR SILL CORRODED FROM FRAME 23 TO FRAME 29 (SSI 53-20-11). MAINTENANCE REMOVED AND REPLACED THE FLOOR SILLS WHICH WERE OUTSIDE THE MFG'S LIMITS. ALL WORK WAS DONE IAW EMB 145 SRM 51-20-03 AND 51-40-02. A/C WILL BE RELEASED AT THE END OF THE CHECK.