As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
*MAIN AVIONICS BAY STGR21L BACK-UP SILL FS333-349 CORRODED (C-CHECK RO 4/25/2022) REMOVED AND INSTALLED NEW MAIN AVIONICS BAY STGR21L BACK-UP SILL BETWEEN FS333 TO FS349 REF CRJ900 SRM 51-42-06-001-001-A01 AND DWG SH670-31810 REV AE. COMPLIED WITH TASK CARD 51-900-1002-SKY. SEE CONTINUE CARD FOR DETAILS.