As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAVY MAINTENANCE FOUND RT AFT CABIN SHEAR PLATE SUPPORT HAS CORROSION LOWER SURFACE FRAME 69 =15" AT NUT PLATE ATACHMENT. R & R AFT CABIN SHEAR PLATE SUPPORT IAW SRM 51-42-11. THIS ITEM HAS BEEN CLASSIFIED AS A LEVEL 2 CORROSION.