Looking to buy a boat that's in decent shape, except the lower units are in rough shape, even though its a fresh water boat. Owner has no money to fix. What would be a reasonable deduction off his asking price? When did merc get a handle on this well known problem? Would the solution be to swap the parts, into new housings or buy new housings ? SEI doesn't seem to deal with bravos. Not sure. Thanks for any advise.