GE side-by-side TFX22PRXBAA. For some time now the bottom drawer in the fridge has been colder than the rest of the fridge - to the point where it freezes items. Past couple of weeks the top of the fridge has been noticeably warmer than the middle of the fridge. Middle has been in the low-to-mid-30's. Top has been over 40 degrees.
The fan in the back of the freezer is working. I emptied the freezer today and removed the back panel. There's some ice build-up on the coils, but it doesn't appear too excessive to me. I'm including a couple of pictures. Any ideas on what the problem is?
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The fan in the back of the freezer is working. I emptied the freezer today and removed the back panel. There's some ice build-up on the coils, but it doesn't appear too excessive to me. I'm including a couple of pictures. Any ideas on what the problem is?

