As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
*CORROSION ON INTERCOSTAL AT FS310-FS349.00 AT STRG21L (C-CHECK) RO 3/4/2021 REMOVED AND REPLACED STR 21L BACK-UP SILL FROM FS310.00 TO FS333.00 REF. CRJ 900 SRM 51-42-06-001-001-A01 AND SRM 51-42-21-001-001-A01 AND DWG SH670-31810 REV-AE. COMPLIED WITH 51-900-1002-SKY