Welcome to iRV2. and the Newmar family.
Individual manuals for the appliances should still be available on those manufacturer's web sites .
If you go to the " Newmar owners forums" , and look for the first posts there the " stickys" from "007" there are answers for every question one could think to ask about Newmar products. Could be a link to a manual there.
If not, I snowbird next to a 99 Newmar 5er and will be parked there for the winter after the first of November , I can see if he has the manual your after.