Re: Integrated Fridge Freezer Issue
It will be part of the fridge evaporator.
The only way to check for refrigerant problems would need an engineer.
The only way you could get an indication yourself would require you to remove the fridge freezer from the cabinet and see if the compressor is running hot and the condenser pipe work not getting hot.
This would then indicate a refrigeration problem low on gas, blockage or compressor worn.
But you would need an engineer to connect into the system to tell which one.
Bob