Welcome to the forum!
Most if not all of the appliances and equipment on your Argosy are common to the RV industry. Some items or parts may be unavailable but are somewhat readily replacable with newer versions. Specific parts unique to A/S's and Argosy's may be had from aftermarket suppliers such as Inland RV. There are generalized technical books that deal with the appliances and equipment available at your favorite bookstore. Finally, you are at the right place right here, feel free to ask or just do a search and once again, glad to have you here!