As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LH FLOOR SILL IS CORRODED BETWEEN FS559 AND FS621. (C-CHECK- RO 11/11/21) UPON FURTHER INVESTIGATION FOUND CORROSION TO BE BETWEEN FS 559 AND FS 559+86. REMOVED AND REPLACED LH FLOOR SILL FROM FS 559 TO FS 559+86 IAW CRJ 200 SRM 51-42-06 AND 51-42-21.