Themembrane panel on my Frigidaire slide in range doesn't allow the numbers 3, 9, and 9, as well as "start" to be entered, on an intermittent basis. I assume the board assembly needs to be replaced, but can't find instructions to do so. The Frigidaire site does not have a service manual for the range. Can anyone help? Estimate sfor someone to come in to replace the board are $700 plus. At that level I'll try it myself.