As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE LT FLOOR SILL BETWEEN FS 280 AND FS 310 HAS CORROSION AROUND ITS NUTPLATES, MARKED WITH BLACK GREASE PENCIL. C-CHECK RO 9/20/2020. BLENDED OUT CORROSION ON LT SILL BETWEEN FS 280-FS 310, REF CRJ700 SRM. MATERIAL THICKNESS IS WITHIN LIMITS, REF CRJ700 SRM AND DWG. SEE CONTINUATION CARD FOR DETAILS.