What was found
DURING MAINTENANCE VERIFICATION IN-FLIGHT PILOT TEST, RADIO HF #2 WOULD NOT TRANSMIT. GROUNDED - YES. REMOVED AND REPLACED HF ANTENNA #2 COUPLER REF B737-900 AMM 23-11-61-000-801/400-801. PERFORMED INSTALLATION TEST REF AMM 23-11-61-800-001. ALL TESTS PASSED. PERFORMED HF SYSTEM TEST REF AMM 23-11-00-730-801 ALL TESTS PASSED. GROUND VERIFICATION TESTS GOOD. VERIFIED ABLE TO TRANSMIT AND RECEIVE. THIS MTX ACTION CLEARS MEL 23-11A.