As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TYS A/C IS IN C-CHECK WHEN INSPECTION FOUND THE APU FIREWALL MOUNTING STRUCTURE AT THE 06:00 POSITION WITH A GOUGE AND POSSIBLE CRACK. MAINTENANCE BLENDED OUT THE DAMAGE AND NO CRACK FOUND, THEN INSTALL A INTERNAL AND EXTERNAL DOUBLER WITH SHIMS FOR THE APU COWLING IN MATCHING LOCATIONS IAW SRM 53-32-04. ALL WORK ACCOMPLISHED AND WILL BE RELEASED AT THE END OF THE CHECK.