LG GRB207TUJA not getting cold?

Hi,
I've got a LG GRB207TUJA american style fridge freezer that is refusing to get cold on both the fridge and the freezer side. I have checked the 3 temp sensors and all are reducing resistance when getting warm (all by the same amount). The compressor is getting very hot and has a low resistance and when turned on it has ~240V across it as expected. The problem occured about 2 weeks ago and I defrosted it and since then no ice has formed on the internal radiator.

Has it lost the gas? Could it be the main board? Anybody got any ideas?

Thanks in advance.

Andy