I replaced the surface element switch. A very easy job; I unplugged the range, then removed twelve screws which held the back cover. The knob on the surface element switch pulled off without any tools, revealing the two screws which held the switch in place. I removed those, pulled out the old switch, and replaced it with the new switch. The wires to the old switch were fitted to two custom plastic plugs, which detached easily from the old switch and slid onto the new switch. Then I replaced the back cover, plugged in the range, and slid it back into place. Everything now works fine.