I bought a display unit kenmore pro range when it was on sale. Model number 79079523600. Unfortunately, our house was not completed yet and by the time we got final inspection and moved in it was 2 days after the warranty ran out on the range... Just my luck. Since installed the bake and convection bake work just fine but all the other features of the oven just give an 'err' on the display. Thinking its probably a control board but any advice would be great. Don't mind working on it myself if I can save some money from having a tech come out. thanks in advance