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Has this been operated out of level recently that you know of? And are you handy with tools so I can direct you in some testing? Please get back to me and I can explain how to sort this out.
Go to the rear of the fridge and disconnect the AC element. Hook it up directly to a good AC source so you bypass all the controls. The fridge should just about freeze up inside if it is working fine. IF NOT, you may have a partially blocked cooling unit and that isn't good. Let me know what happens. All follow ups are included in our fee.
What did you find when you hooked this up directly to AC power? Did it change the cooling at all? IF NOT, then the cooling unit is probably failing and it may need to be rebuilt. Please get back to me if you need more input from me on this. Thanks!