As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CORROSION ON INTERCOSTAL ATTACHED TO STGR 20L BETWEEN FS 310.00 - 349.00 (C-CHECK RO 8/24/2024) REMOVED AND INSTALLED NEW BACK UP SILL P/N SH670-31823-1 REF DWG# SH670-31810 REV: AE AND CRJ 900 SRM 51-42-06-001-001-A01. COMPLIED WITH SKYWEST TASK CARD: 51-900-1002-SKY PRESSURE CHECK GOOD.