As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING C-CHECK IN BNA, INTERCOSTAL FLOOR SUPPORT FLANGES ARE CORRODED AT LBL 10 BETWEEN FS 236 AND FS 258. MAINTENANCE REMOVED CORROSION IAW SRM 51-70-40, MATERIAL REMOVED IS OUT OF LIMITS. NEW FLOOR SUPPORT FABRICATED I/B SIDE LBL 10 STA 236 & 258 REPAIR ANGLE FABRICATED FOR O/B SIDE. ALODINED AND PRIMED, INSTALLED REPAIR AND NEW SUPPORT IAW SRM 51-40-21.