As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUND PAX DOOR INTERCOSTAL DD4 TO BE CORRODED IN MULTIPLE LOCATIONS. C-CHECK RO 11/11/2020. INSTALLED SERVICEABLE PAX DOOR INTERCOSTAL DD4, IAW CRJ 200 SRM. COMPETED TASK CARD AND ATTACHED COMPLETED FORM 337. NO WEIGHT CHANGE, REFERENCE CONTINUATION CARD FOR WORK PERFORMED.