Hi Dave thanks for that.
What you need to do with this one is first defrost the unit completely. 24 hours with the doors open.
Once you do that the system may work fine, but we wont know until then.
It sounds like the defrost tube is clogged with ice so that is the only way to solve this problem. This does happen occasionally.
Also check your door seals to make sure they look like they make good contact all around, as that is a cause as well ;-)
In any case, I will stick with you until this is complete.
Please rate my service kindly.
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Thank you Dave.