Where can I buy a replacement for my built in 6855? ?

My built in Diplomat 6855 is suffering from the same complaint as the previous subscribers. i.e. Fridge running on H. The engineer can't be bothered to mend it and has suggested to the insurance company I get a new one which I have to do myself. As it is a built in 50/50 where do I find a replacement now that MFI is no more? Is there an alternative make/model Where do I begin??? Is it really better to scrap the fridge or try harder to have it fixed?? Help!!!!