I have the ARP device with two additional exhaust fans controlled by the ARP. Not sure if there are fans on your installation, but on our rig with the Norcold 1200, there are two fans mounted below the upper vent, and they are controlled by a snap switch that is mounted on the fins at the top of the unit. The snap switch failed a while back and I was able to replace it and got the factory fans working again.
https://www.arprv.com/