From reading your original post, I see you mentioned attaching a ground to the monovalve. You will get all kinds of strange scenarios with a constant ground at the monovalve. The ACC controller provides a ground and power, depending on settings. (I went through this on mine when I found that the PO had modified the monovalve wiring.)
Here is what I did to get mine working:
Open the ACC controller and resolder the edge connections where the circuit boards meet in an "H" pattern.
Mightyvac and test the vacuum pods one-by-one. They can all be checked from the vacuum switches behind the kick panel on the RH side of the console. Replace rubber diaphragms in pods that will not hold a vacuum.(
www.autoluxmbz.com) or pods in the case of def. or fresh/recirc.
Rebuild monovalve (mine had no heat)
Note: about the only thing I've heard that resulted in taking out the controller is a defective aux. pump. Putting in an in-line fuse, to the pump, remedies that.
Stay away from modifying wiring, do these basics and you probably have an excellent working system.
Modifications and just swapping parts out will be not much more than shooting at rats in a dark barn. You will end up not knowing what does/doesn't work, frustrated, uncomfortable and saying that the climate system is a nightmare.