We have recently purchased an 1984 37ft Oday. The holding tank for the aft head seems to be seeping back into the head despite having the settings on dry bowl and and in a locked position. Ick, I think both heads were replaced before we bought the boat, but I don't think the previous owner did anything with the holding tanks. The bowl back fills almost to the point of overflowing, more ick. We can pump it out but it seeps back again. Any ideas or initial thoughts on troubleshooting this issue?
Much thanks in advance.
Much thanks in advance.
