What was found
PER MAINTENANCE REQUEST, HF1 TESTS OK. HF2 WILL NOT TRANSMIT BUT WILL RECEIVE. GROUNDED - YES. FOLLOWED B737-800 FIM 23-11 TASK 806, THROUGH E(3). HF SYSTEMS 1&2 OPERATE CORRECTLY ON GROUND, AIRCRAFT TO AIRCRAFT. DUE TO EXTENSIVE HISTORY, CONTINUED WITH PARAGRAPH (H). METER CHECKS FOR COAX CABLE BETWEEN #2 HF TRANSCEIVER AND #2 HF COUPLER WERE GOOD NO DEFECTS NOTED. REPLACED #1 HF COUPLER PER B737-800 AMM 23-11-61/401. REPLACED THE #2 HF COUPLER PER AMM 23-11-61/401. REPLACED CONNECTOR D625 PRECAUTIONARY PER SWPM 20-51-00. #1 &2 HF OPS NORMAL REF AMM 23-11-00.