As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RT CABIN PRESSURE FLOOR SILL HAS (2) AREAS OF CORROSION ON THE SILL SKIN BEWTEEN FS 513.00 AND FS 529.00. C-CHECK RO 11/11/2020. REMOVED CORROSION AND TREATED AREA, IAW BOMBARDIER REO. NO WEIGHT AND BALANCE CHANGE. M-337 AND TASK CARD ATTACHED.