What was found
TCAS ANTENNA DOUBLE CHANNEL CORRODED AT STR 27. EVALUATED TCAS ANTENNA DOUBLER CHANNEL AT STR 27, NO DAMAGE ALLOWED IAW SRM 53-21-01-101-002-A01. REMOVED ANTNNA & DOUBLER CHANNEL IAW AMM 34-43-07-000-801-A03 & 51-42-21-001-001-A01 AND 51-42-06-001-001-A01. INSTALLED TCAS CHANNEL ASSY IAW SRM 51-42-06-001-001-A01, 51-42-21-001-001-A01. LOCATED AND DRILLED TCAS DOUBLER CHANNEL IAW SRM 51-40-001-001-A01. REINSTALLED ORIGINAL TCAS BTM ANTENNA IAW AMM 34-43-07-400-801, A03.