What was found
AFT CARGO DOOR SILL IS CORRODED. REMOVED AFT CARGO DOOR SILL (PN: MM670-35655-003) IAW CRJ900 SRM 51-42-21-001-001-A01, 51-42-13-001-001-A01, AND 51-42-06-001-001-A01. INSTALLED AFT CARGO DOOR SILL (PN: MM670-35655-003) IAW CRJ900 SRM 51-42-21-001-001-A01, 51-42-13-001-001-A01, AND 51-42-06-001-001-A01.