Hi Jeff, As the gas knob light and ignition is working it proves you have power up to the back of the main control box.
I've just checked a working unit and there is a permanant 0.163v on pins 1,2,3, (red, black & blue), of the slide switch loom. When switched on pins 4,5,6, (white, brown & yellow,) have varied voltages up to about 3.5V depending on setting. I've not got a duff switch I can test but I'd expect your's to show nothing on these last three but the first three will be the same at or very near 0.163v.
If I'm right then it looks likely the switch is faulty and will need repair which leads us to your last question.
I'm actually worldwide but much as I'd like, sadly unable to come in person, luckily though my postman Colin is a good intermediary!