Contact Monaco and ask for your data or build sheet. It will have most of the components used to make your coach by manufacturer, model, and sometimes SN.
My AC units are Dometic, here is a link for what they supply
https://www.edometic.com/allusr/sp.nsf/spc?ReadForm
Once you figure out your model you can go to that model and see what is available.
What is wrong with the AC unit. It might be feasible to fix.