Did you get all the manuals with it.
Did they have a copy of the data or build sheet which lists most of the main components by manufacturer, model, and SN, this is good to have when you are looking for parts or trouble shooting.
You can get a PDF copy of the operators manual here
Monaco RV Owners Manuals | Monaco Coach
For some reason they don'e show a 2003 but a 2002 or 2004 will provide similar info.
I would also recommend you register yourself as the new owner with Monaco, they will have lots of info if you ever need it.
I would suggest you request a PDF copy of the wiring diagrams, comes in handy and easier to use then the paper copies.
RV Wiring Diagram & RV Plumbing Diagram – Request Technical Assistance | Monaco Coach