According to online research an ammonia absorption type refrigerator should work to -52 degrees F. Even though this may be radical, you may try a heat source at the rear of the fridge to see if it helps, for example a high wattage incandescent bulb or a small heater (Mr. Buddy or similar) just to see if it comes back on (do not leave heater in the compartment). It still sounds like you do not have DC power to the unit, but it could be temperature related as well. Did Dometic give you a troubleshooting guide for verifying that the fridge is receiving DC power to the control board. Just trying to help here.
Bingo
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