I have an old Roper in the wall oven. When you press the bake button it will not let the temp go higher than 220 degrees. It displays 170 degrees-the oven turns on and then as you turn the dial it jumps back and forth from 170-220 and ---. The clock is acting the same. Push the clock button and as you turn the knob it only jumps back and forth over a couple of minute span. I was thinking I needed the Control Board #4342971 however it is discontinued and I can't find it anywhere. I was recently told that the relay board # 4338627 is available still. Do you think the relay board replacement would solve the problem? The model number is Roper B9308B3 Serial number 8D00478. Up until this point it has been a great oven for the last 16 + years. Thanks for your input.