Replace 3240 BW converter in a 1988 Hawkins Motor Coach

Usually the converter proper is a separate sub-chassis when it's mounted as a part of the distribution panel, and can often be replaced with more or less ease without greatly disturbing the rest of the setup. You generally can get at them from the front (removing screws and sliding out the unit).

I'd suggest contacting the nice people at bestconverter.com; they have a lot of expertise in these sorts of things, as well as having good prices on new converters.