What is a "new cp370" with an adapter cable for the transducer and the network? Is the through hull
transducer part of the problem in your mind? Elsewhere I have read that an A8/0025 cable from Raymarine
should be installed to replace the existing cable. I am not sure if by that it is meant the cable coming from the through hull transducer to the DSM or the cable connecting the DSM to the MFD.