As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BACK-UP SILL AT STGR21L BETWEEN FS333.00 AND FS349.00 CORRODED. (C-CHECK RO 6/04/2021) EVALUATED, REMOVED AND INSTALLED NEW BACK-UP SILL AT STGR21L BETWEEN FS333.00 AND FS349.00 REF DWG SH670-31810 REV Y AND CRJ 700 SRM 51-42-06-001-001 A01. SEE CONTINUE CARD FOR MORE DETAILS. COMPLIED WITH CARD NUMBER 51-900-1002-SKY