As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING EO NR R53580, FOUND CORROSION BETWEEN FS 295 AND FS 310 STR 27 ON THE DOUBLER FOR LOWER TCAS ANTENNA. REPLACED DOUBLER FOR LOWER TCAS ANTENNA, IAW CRJ 900 SRM 51-42-06-001-001-A01 AND CRJ 900 AMM 34-43-07-000/400-801-A03.