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 C-CHECK WHEN INSPECTION FOUND A CRACK IN THE APU FIREWALL. MAINTENANCE REMOVED AND REPLACED THE FIREWALL IAW EMB 145 SRM 51-40-02 AND IC 2009-145/06143. ALL WORK WAS ACCOMPLISHED AND WILL BE RELEASED AT THE END OF THE CHECK.