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The first thing you'll need to do is pull everything out of the freezer and remove the lower back panel inside the freezer. Look at the silver evaporator coils behind this panel and are the packed with frost, lightly frosted from top to bottom, some frost on top but not on bottom, not frost at all, etc... ? Also, is the fan above the coils running?
There are numerous possibilities at this point as to what can be wrong so until you know what the frost on the silver coils looks like you can't really get a direction as to what can be causing the problem.
yes you should unplug it. It's about an hour later now since when you asked the question so I won't be on much longer so I may end up having to reply tomorrow if I don't get your reply before I log.
If neither side is cooling at all then I would pull the refrigerator out and remove the lower back access panel. Touch the big black round compressor and is it warm, blazing hot, or room temperature? Is the fan next to the compressor running? Please don't reply back until you have those answers.
OK so that means that the compressor is not getting power. There is a common problem with this refrigerator where the relay on the main control board mounted to the back of the refrigerator shorts out. That entire control board behind the 8" x 10" sheet metal panel on the back of the refrigerator will need to be ordered and replaced so below is a link to the part.
CLICK HERE for control board
It takes me about 15 minutes so you might want to give yourself more time but it's all plug and play and very straight forward. No special tools are needed.
Nope, you just plug the unit back in.