Just purchased a 2001 Four Winds Five Thousand 23A.
Pretty disgusting inside (dirty), but during cleaning I found (drum-roll please):
The original pouch with all the original manuals in it!
So if someone has a similar unit and needs copies, let me know with a personal message.
The manufacturer (now Thor) only has a generic owners manual available, nothing else. Equipment is pretty standard (water heater/fridge/A/C), but some items are coach specific. Hence the 'hidden' switches for heated tanks in the rear of the kitchen cabinet.
I could also use help from other owners of this type, e.g. the sales brochure says all come standard with a water heater bypass, yet no manual shows so nor can I find it on the rig.