Well I have just been through a problem where the fridge and freezer wasnt getting cold enough.
I have had mine about 6years.
I didnt realise at the bottom of the freezer, where the grill is, you can take this off, So I did and it was completely blocked with dust,( this needs to be clear for the hot air to be dispersed) I turned the fridge freezer off and took this panel off, I also took the panel off at the back, the lower panel at the bottom, thats where I started, Hoovering and using a duster to get all the dust off the "elements". You will see there is a fan at the back that cools the elements, that can slide to one side, be careful though, make sure all is dust free and put back together, I then switched the frost free fridge freezer back on, the fan wasnt running ? but while I was looking up a help line on the pc, all went back to normal, the fridge has been fine since, a simple solution, nearly overlooked, of course this may not be your problem but is worth a look !
(PLEASE MAKE SURE FRIDGE IS SWITCED OFF AND UNPLUGGED FOR SAFTEY !!)
Terry Seyforth, July 2005