As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT CARGO DOOR SILL CORRODED, MULTIPLE AREAS MARKED. C-CHECK RO 12/26/2020. FOUND REMAINING MATERIAL OF AFT CARGO DOOR FLOOR SILL TO BE OUT OF LIMITS. REMOVED AND INSTALLED NEW AFT CARGO DOOR FLOOR SILL, REF CRJ 900 SRM. SEE CONTINUATION CARD FOR DETAILS. COMPLETED FORM M-337.