As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CORROSION FOUND ON INNER CHORD P/N MM670-35656-001 UNDER AFT BAGGAGE DOOR SILL BETWEEN FS.1000.00 & FS.1015.00 (C-CHECK) RO 5/10/2020 REPLACED INNER CHORD P/N MM670-35656-001 UNDER AFT BAGGAGE DOOR SILL BETWEEN FS1000 & FS1015 REF BOMBARDIER DRAWING, CRJ900 SRM.