As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LT SIDE WALL SEAT RAIL HAS CORROSION FROM APPROXIMATELY FS 409.+128 TO FS 559.0+80, MARKED. C-CHECK RO 11/21/2020. REMOVED CORRODED LEFT-HAND SIDE WALL SEAT RAIL FROM FS 409+128 TO FS 559.0+80 AND INSTALLED NEW SIDE SEAT RAIL, REF CRJ200 AMM.