Freezer appears to be working fine. Display on front says all is working fine, but fridge is warm at top about 15 degrees, gets colder towards the bottom about 5 degrees, even though display says 3 degrees. Some ice forming around holes/vents near bottom of fridge on the inside. Cleaned dust from vents underneath and at back. Tried switching off and defrosting fridge side only, switch back on same problem. Any ideas...it is only 3 years old.

J, June 2014