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Are you able to remove the rear wall from inside the freezer to see if there is frost on the coil behind it?
Does it seem to be frozen?
Do you have a hair dryer you could use to heat it a bit and see what happens? It is important to get a look behind that panel.
You could turn it off for 24 hours with the doors open and then see what happens. If the cooling restores, we would know it is an air flow issue caused by a lack of defrost.
Yes, if it is not cooling in the refrigerator but okay in the freezer, there is something blocking the air flow.
Not at all! That is why I love my job, I love helping people to learn!
It would be best to turn the power off at the mains if you can't unplug it to let the electronics reset and it thaw, though.