As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN AVIONICS BAY TCAS ANTENNA DOUBLER CORRODED BETWEEN FS 295.00 AND FS 310.00. C-CHECK RO 10/9/2020. EVALUATED REPAIR, FOUND TO BE OUT OF LIMITS. REMOVED AND REPLACED CORRODED DOUBLER, REF MHI RJ REO DWG CRJ 900 SRM AND CRJ 900 SRM. COMPLIED WITH SKYWEST TASK CARD STRUCTURAL MAJOR REPAIR (RII). SEE CONTINUATION CARD FOR DETAILS OF WORK PERFORMED.