I have a Frigidaire side by side fridge. Freezer side is cold...makes ice....all good. Fridge side was not cooling. Found out freezer side was frosted up. Defrosted the whole unit, took the back off and vacuumed/cleaned the coils. Plugged back in and waited overnight to check temp of fridge. Freezer ok....fridge temp only dropped about 10 degrees (to about 50). The fan is running (took back off again this morning to check) but it does not seem to be putting out a lot of air in the vent at the top of the fridge section. Any ideas on what I can check?