What was found
R HF X-MISSION, INOPERATIVE AT ALL CREW STATIONS. CYCLED C/B, NO HELP, TURNED OFF THEN BACK ON, WORKED NORMALLY FOR REST OF FLIGHT. REMOVED RT HF COUPLER, DISCONNECTED LT HF COUPLER COAX CABLE. REINSTALLED COAX CABLE LT HF AND INSTALLED SERVICABLE RT HF COUBLER IAW AMM. OPS CHECKS NORMAL. (K)