Any ideas of why my refrigerator is not cooling (gets to ~60 degrees)...

Things I've tried:

* fan & compressor appear to be working okay, coils are clean

* freezer works fine, in correct temp range

* defrosted the fridge overnight, minimal water (was hoping for frozen coils in freezer)

It's a Frigidaire (Electrolux) should that matter.

Fridge is 15 years old - time to bite the bullet and get a new one?

Thanks in advance.

~alan