2021 Landmark 365

Hello, I have tried 3 different times to get my rig in to have what I was told was a thermostat relay switch replaced. I have 3 AC/HPs and the living room unit reads 127 degrees 24/7. It has never come on and it also makes it so the furnace does not work. Anyway, the part is next to impossible to get. If I was to get one, does anyone know how I could replace it myself. I am somewhat mechanically minded, but electrical stuff is outside my comfort zone. TYIA
 
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