As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SERVICE DOOR THRESHOLD IS CORRODED BEYOND REPAIRABLE LIMITS ON THE THE UPPER FLANGE. NEEDS REPLACED (C-CHECK RO 8/5/2021) LOCATED , DRILLED AND INSTALLED NUTPLATES ON NEW SERVICE DOOR SILL THRESHOLD IAW CRJ 200 SRM 51-40-11 AND 51-42-06 . REFERENCE CONTINUE CARD FOR WORK PERFORMED . REFERENCE CP# 22291359 FOR INSTALL.