You will indeed need to replace the board. Sears charged me $305 for it and I had to wait a week. Make sure that after they replace it, that they check that the warmer drawer is re-connected or you will need them to come back yet again.
Also when they are done, check that the self cleaning function works. Mine still does not and I am waiting for a reply from customer service. I hope that you have better luck than I have had. You might try a local appliance repair person instead of Sears to get a better price and service.
Been there, Londonderry, NH, February 2005