Welcome to irv2.
What they intend to do is upgrade your four button control
and make it a five button control
and two control boards will have to be change in the AC's.
There is also a newer control system
now they maybe considering.
If you remove existing control from wall and clean with contact spray the tel wire connector and work in & out of the control may clean up any oxidation on wire contacts or find a new, most likely rebuilt 4 button control.
In my signature below are three links related to your Newmar.
Enjoy the forums and join us down in the Newmar forum.