As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SERVICE DOOR SILL COVER PLATE HAS CORROSION. C-CHECK RO 12/05/2020. REPLACED DOOR SILL PLATE P/N 601R38957-31. LOCATED NEW HOLES, INSTALLED 6 NEW 8-32 DOME NUTS, IAW CRJ200 DWG 601R38957 REV F CRJ200 SRM SOLID RIVETS AND CRJ200 SRM HOLE PREPERATION.