The tubes bundle that I suggested to pull out and clean is the big bronze inner part of the heat exchanger, marked as # 5 in the diagram. The OR...
It shouldn't, also because if you are talking of a check that you made recently, it can only get worse - possibly MUCH worse - when the sea water...
Interesting. I didn't even think of steering, which I assumed driven by DC electrical motor, as you eventually opted for. Are you now going to...