What was found
LOWER TCAS ANTENNA INTERNAL DOUBLER CORRODED AT FS 300 STR 27. - REMOVED & REINSTALLED TCAS ANTENNA IAW CRJ 900 AMM 34-43-01-001-400-801-A03, REMOVED AND REPLACED ANTENNA DOUBLER IAW SRM 51-42-06-001-A01, 51-40-11-001-001-A01, OPS CHECK IAW AMM 34-43-00-710-801-A01, RESTORED SURFACE IAW SRM 51-25-01-001-001-A01, NO FAULTS NOTED.