Zanussi fridge freezer model 67/42 ff - fridge not working

[dinos]

Hello All, I have a zanussi fridge freezer (67/42 ff) which we have had for 18 years a super fridge freezer however in the last few days the fridge does not seem to work - the light inside the fridge switches on and the freezer works perfectly.
We had to get it repared a few years ago and the engineer I am sure repaced the controller behind the temp control. Can anyone suggest / point me in the correct direction to resolve and if it is the switch what sort of price are we looking at replacing - I would try and repace myself - hoping in time to put some beers in for the World cup! - any advise welcome please.

 

[big-all]

if its a frost free fridge freezer you can try defrosting it for 24 hours

you have a void behind the skin off the fridge that allows the cold air transfer from the freezer this can get blocked with ice