I joined to see your pictures, but they've apparently been removed.
Stumbled on your post while looking for plumbing diagram for 2004 Tiger River Bengal. Hopefully you're still having fun in your hot tub, I'm just getting started with repairs on this one. Replaced the leaking heater, and then found that I have another leak, spent several hours digging out, chiseling off, and cleaning up foam, found cracked fitting, but want to make sure it's not a check valve before I try to repair it. Due to 7-8 fittings all tied together I'm going to try an epoxy repair before replacing things.