I don't know for sure about your fridge, but most frost free types employ a fan that blows cold air from the evaporator in the freezer section into the fresh food section.  If that fan isn't working, the fresh food section would be warm, particularly if yours is a bottom freezer model.

If your fridge doesn't use a fan and has a separate evaporator in the fresh food section, there may be a blockage in the refrigerant tubing.