As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
* CORROSION ON LH FLOOR SILL UNDER AFT OVERWING EMERGENCY EXIT DOOR BETWEEN FS 761.85 €“ FS 785.15 (MARKED) (C-CHECK) RO 5/10/2020 REMOVED CORROSION FOR LH FLOOR SILL UNDER AFT OVERWING EMERGIENCY EXIT DOOR BETWEEN FS 761.85 AND FS 785.15 PER REFERENCE CRJ 900 SRM. FOUND TO BE WITHIN LIMITS PER BOMBARDIER REO.