Product review (5 stars): instructions on how to replace the switch are easily found on the internet
The stem on a switch broke off on our kitchen range.  I thought this meant a service call, and $400 down the drain.  Instead, instructions on how to replace the switch are easily found on the internet, and it wasn't that complicated (unplug the stove, or turn of the circuit breaker first).  I ordered the replacement switch on Amazon, arrived in 2 days, and and the knob and burner work perfectly.  Kitchen range fixed, all very easy.  Don't be intimidated by what looks like a technical and complex job --- it isn't.