This link will have general area locations for 12v fuse locations in a DP not sure about your load center but would be near the main 12v fuse panel in most coach's I have owned.
There is information on the E-PLEX system in
QT's # 3 with much other info you may need.
All the links below in my signature will have Newmar info and you can follow the directions in
this link to find info for your particular coach.
This link will lead you to more info for your coach.