I am no technician or repair person however my rfrig and frezzer move from colc to cool and from cool to warm, melting butter and warmeing lieuids in the frig. The freezer takes forever to freeze ice cream and anything that may be liquid. I am told the mother board needs replacing to the tume of 350.00. I neede to know the the repacement labor intensive. The part is on sale for 135.00. Can a do it myself without messing up something?