As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
*CORROSION ON AFT CARGO DOOR SILL. AREAS MARKED. (C-CHECK) RO 2/1/2021 REMOVED AND INSTALLED NEW AFT CARGO DOOR SILL. REF CRJ-900 SRM 51-42-06-001-001-A01 , SRM 51-42-21-001-001-A01 AND DWG MM670-35085 REV G. COMPLIED WITH TASK CARD 51-900-1002-SKY.