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Westinghouse fridge keeps tripping RCD

Westinghouse Fridge Freezer model WBM3700SB Tripped the RCD last night, disconnected everything until we figured out it was the fridge causing it. Quick youtube and so disconnected the defroster heater which has stopped the RCD tripping when the fridge is back on, but I don't want to mess with anything from there on in. Ideally if you have the parts available that would be great please.