My fridge isn't working but my freezer is.

Based on other threads, I opened the back panel to check for frost. No frost, the coils look totally clean.

I turned the fridge on and the fan behind the back panel in the freezer (the evaporator fan? my terminology might be wrong) is spinning happily.

I can't see any ice blockage further up between the fan and the fridge. But maybe there is? How do I check for it? What else could be going wrong?

Is there a fan in the top part / fridge module that could be broken? I'm not hearing any sounds coming out of the fridge part.