Fridge is at 45 and freezer at 25. When I touch the control colder/warmer buttons, the freezer shows -3 and fridge 37. But then jumps right back to the 45 and 25 reading. I've been reading this forum and trying to figure out how to run a diagnostics test. When I search for this model, no exact matches come up and I know the number is right because Im getting it off the plate inside fridge. For this problem, can you tell me what is the most likely part I should replace? Thanks for any help