So I have a CalSpa 2100 from the early 90's .. tub is in great shape but the pump just went bad. It's the old heavy duty dual wet end pump that is super hard to replace and pretty expensive. I know I can retrofit the plumbing and go back with a conventional 56 frame pump but I'd rather NOT do that unless I just have to. Any guidance ...or know of any dually's for sale? Thanks!