I am looking for manuals / plumbing schematics / parts lists / etc to order parts as well as fixing the following SPA.

It is a MARQUIS RECREATIONAL SERIES

The model # is KV-43-1-0-057503CC
I looked on website and their spa docs start with 2000-2005 models.. My spa is 91" sq. and does not match any of their pix. I believe that it is around a 1997-1999 model. It has a balboa 54051-03 mdl#du-rcrtnl-dca pack / two pumps / ozonator.
I tried to get info from Marquis support, but it has been three weeks and I have not heard anything...

I have enclosed some pix to help.

Any help or links that you might have would be greatly appreciated.

Unless you can come up with a specific part that says "Marquis" on it, everything in there is pretty much generic.

What's the problem with it?

I have never had a spa before I guess it would be a "security blanket" for me having the ALL info at my fingertips. I have replaced suction fittings so far and there are a couple of lines that were capped off that I joined together as well there are some neck jets that are busted that I will need to replace as well. There are lines hanging down that are not capped that I have no idea where they go..( Lost in sea of foam )

There are two filters next to each other.. do you fill it until two thirds of the tallest so the lower is submersed or what??