Is it worth repairing my Hotpoint Mistral Plus Frost Free Fridge Freezer?

The freezer seems to work, but the fridge is not cold anymore. The light still comes on, but there is no noise.
I have hoovered out all the dust at the front behind the removable grill and at the back behind the plastic cover but this has not helped. It was leaking water onto the floor, which has stopped - I de-iced the bottom drawer which kept getting iced up. Any ideas what might be wrong with it? Should I get it fixed or replace it? I have had it about 6 years and it was second hand, but not very old when I got it.