My Kenmore top fridge/bottom freezer is freezing all of the vegetables in the bottom drawers. I've measured the temperature at different levels throughout the fridge and it will measure about 10 degrees warmer at the top of the fridge than at the bottom of the fridge. For example, if it's 43 on the top shelf it will be 33 (or even 32) in the drawers. This did not previously happen.

Some information about the fridge:
- The freezer is cold and stays at the right temperature. The icemaker has a small leak when it's running but I don't think that has anything to do with this problem.
- I replaced the fridge damper about a year ago. Changing the temperature setting will change the fridge temperature, but the temperature gradient still remains. This tells me that the damper is working.
- When I pull the freezer out if the fan is on I can feel lots of air blowing out of the vent in the back. I can also feel air coming out of the top of the fridge vent when the fan is on.

What should I be looking to test or replace? Thanks!