What you do is the only thing you can do. Replace each item that eplex controls with a native controller. Starting with the AC system.
You need to get a Dometic 5 button thermostat and connect it to the AC comm cable behind the e-plex screen. That will make your coach somewhat usable.
See my profile and review my posts about eplex. My 2006 coach has all systems (except AGS and power monitoring/management) migrated away from eplex .
Once the ACs are working, you will need to get a new tank monitor system (see level), and a new controller for the magnum inverter.
More of this kind of discussion is appropriate over in the Newmar forum. No one else will understand what eplex is.
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2006 Newmar Essex 4502
2015 Jeep Grand Cherokee
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