Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
Corrosion is a danger to electronics working, in any maritime or riparian context. I advise you to turn off the equipment in the setup, then to examine all lines to the equipment, along their entire length, looking for breakage, cutting, severe bending, or leakage of corrosion or rust showing some small degree of breakage etc.
Then disconnect each connection along the lines, starting with the connector on the device, one at a time (so as not to confuse how to put them together again! which can happen.)
Then examine both sides of the connection, scrub off thoroughly with a clean dry brush, then wipe the metal with a clean dry rag until it shines, then re-connect firmly, and on to the next connection.
That may help with the problem. If it doesn't, tell me more about the components involved in the setup (I of course know that you have a 'Sailor MF/HF 6360' transceiver, that has a Thrane connection to some other device, devices, antenna perhaps, etc.)