Fridge is running too warm (freezer sti...

The main compartment of my fridge is running about 10 degrees too warm. Freezer is working fine (thank god!). Freezer is in a seperate compartment with its own door.

I did a huge defrost, hoping to melt ALL the ice in and around the fridge in case it was blocking something, but it doesn't seem to have made any difference.

Ideas? Suggestions? I am all ears. Gurus, please help!

Fridge is a Sears Coldspot. The only model number I can find is 7642010, although the Sears website tells me that isn't a model number. The other number on the plate is S53050109 if that helps at all.