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You have a freon leak, basically you have no freon left in the system. IF you were to check the evaporator you will find nothing frosty or cold at all. You need to have the unit recharged with gas.
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On the Traulsen unit there is only one evaporator that controls both sides, there is no low pressure cut off like an outside AC unit. Yes there may be a small amount of refrigerant left in the system enough to cool a rung or two on the evaporator so you would get 38 degrees in the freezer, but if you put a load on it(food in it) it would probably not even maintain that temp. You can visually just check it, but I have fixed hundreds of Traulsen units and yours is very low on freon. If you need something else just let me know.
Yes there is a leak so you would need to add dye in the unit to find it. It may have had a leak slow leak 6 months ago as normally it would be a low side leak, but when the unit is constantly running the leak is a lot slower since the low side pressures are far lower than when it is just sitting especially for that long.