Do you know what the box temperature is in relation to the fin temps you described? If I understand you to say that you are experiencing 107degree temps outside, (which is pretty hot) and the frig is running between 40 midday and 30 at night, I would not be concerned if it was my rig. I just don't know how fin temp correlates to box temp which is why I asked if you know your box temps. Our dometic is not the same model, but we run box temps 36-39 during the day, bump ups a bit during the defrost cycle to 41-42 and usually 35-36 when we get up in the morning with high 90s outside. Easy cheap fix, go to Walmart, get a 4 inch 110 fan, place outside in the lower vent pointed straight up, to help push the heat up and out.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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