There are a few things to check. One is to make sure that the flap between the doors is closing all the way. Some hang on the "Made in the USA" sticker on the bottom of the fridge and do not close all the way. If so, remove sticker and possibly put a small nylon washer under the left door hinge.
This one is what was wrong with ours initially. Take a very bright LED flashlight, turn it on and put it inside the fridge at night, then turn off ALL outside light and look all the way around the seals for light escaping. The seals on ours had been strapped somehow during shipping of the unit and compressed the seals about a quarter of the way up and down both outsides of the doors. The doors had to be replaced as the seals are not replaceable themselves.
Hope this will help you trace it down.
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2020 Montana 3790RD Legacy EditionOnan, TST TPMS, TrailAir pin, Discs,
2013 F350 DRW 4x4 CC LBViair 10007, Ride-Rites, Westin HDx, 12k Smittybilt
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