(... continued) FYI, one side of the keytail has the exposed wires which make contact with pins in the receptacle on the control board. the exposed side is on the inside surface of the curled keytail ribbon, the outside surface is translucent plastic insulation (you can feel that the outside is smoother than the inside because the inside has the contact wires exposed). the inside is the side you want to make sure is clean because those are the wires that need to make electrical contact with the pins in the receptacle.
next, use sharp scissors to carefully trim a small uniform strip (roughly 1/16 of an inch or less) off the end of the keytail. then plug it in again (remembering to use the top portion of the receptacle to secure it in if you had removed it). doing this provides a fresh spot on the exposed wires to make contact with the pins in the receptacle. my theory is that over time the wires wear out at the points where they make contact with the pins. trimming the edge allows you to insert the keytail deeper into the receptacle and therefore, the pins will contact the wires in the keytail at a new, unworn spot. it's been over a week now and so far, it seems to have fixed the problem on my stove. if I get the error message again in the future, my next step will be to try paper trick again (at least as a temporary solution), but I doubt it will be necessary any time soon.
be sure to try all other solutions first before ordering any parts. I first changed the control board for $125 and there was no change. then I ordered the touchpad, but ended up fixing the problem before it arrived. I sent the touchpad part back to Sears Parts Direct after I figured out I didn't need it and they eventually refunded $15 less than I'd paid. of that difference, $13 and change was for shipping, so the other dollar plus must have been a miscalculation or a restocking charge or something, but I didn't bother following up to find out.
good luck with your repair.