HDVS120 Vintage Select wine cooler thermostat is not working

I have a Vintage Select Wine cooler which no longer gets cold enough. I had repair guy come and pur freon in it and it still would not get cold.
He suggested getting a new smart board for the cooler but they no longer sell the part.
His other suggestion was to get an external thermostat and bypass the internal thermostat.
I’m having trouble s figuring out how to connect the external thermostat to bypass the internal thermostat.
Which wires internally do I need to disconnect?
Thanks,

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