That panel looks complicated enough to be controlled by a microprocessor (computer). Like all computers, they sometimes end up in a fault state and require a "Reboot".
The dealer may have tried this, but if you disconnect the power to the panel for about 10 minutes, then restore the power, you will have rebooted the system. It cannot hurt, and it may be the simple fix.
Good luck.
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2019 Coachmen Freedom Express 192RBS
2015 T12RBST Flagstaff Hardside
Disclaimer: The actual value of my "Two Cents" of advice varies just like a bitcoin.
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