Unplugged oven and removed back panel of oven, found schematics taped to back of oven. Found a relay board that was burned where upper heating element plug connected to it. Replaced relay board and then repaired burned connector by replacing the spade terminal ends that were melted. Suspect connection was loose and that caused board damage. The other board i replaced because some display segments had stopped working with oven temperature. Was difficult to see what temp the oven was. This was a secondary repair.