Monaco did provide a Data or Build sheet that listed the main components of each coach with the make/model and sometimes SN listed. This included the Axles, Transmission, Engine & ECU, main Hydraulic pumps/motor, steering box, tires etc. It also include AC units, most of the appliances along with other stuff like TV's, radio etc.
I took that list and started to build a data base of operating, parts, and troubleshooting manuals
You can try and request a copy of the build sheet, https://www.monacocoach.com/technical-assistance
I would also ask for all the wiring diagrams, house and chassis.
Monaco had an extensive sales and service network across the USA prior to the bankruptcy. At some point in ~2010 after bankruptcy the security of their network open and the database of parts information for each coach was available, just had to put in the VIN and all the info was accessible. I took the opportunity to download +100 parts pages for my coach before they locked it down. I believe this database is still available and a reputable repair facility may have access to it. I have used some of the Monaco PN's and looked up the parts on the REV website.
Hope this helps.