Welcome to the forum and irv2, wasp. Greeting from across the pond.
Here is a link to get you started TSB Link
top of forum you will get a brochure
, oldest owners guide
we have, a 5th wheel but will give you how some funtions work and much more information.
The links below in my signature will also have info for the Newmar.
As far as ECON -- chassis could be a Ford or Chev found here.
We also have seach engines
located in QT's # 3
--- irv2 and Bing which will find old info on your coach there have been others with same coach some time back just post info found in the brochure should lead you to info you need.
Enjoy the coach and safe travels in it.