As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PAX DOOR DD4 INTERCOSTAL IS CORRODED BETWEEN FS 311 AND FS 347. C-CHECK RO 11/12/2020. INSTALLED NEW PAX DOOR INTERCOSTAL DD4 PN 601R318081-1, IAW CRJ 700 SRM. SEE CAMP CONTINUE CARD FOR MAINTENANCE PERFORMED. NO WEIGHT CHANGE. COMPLIED WITH M-337 AND M-131.