Hello Richard;
My name is Peter. I am a retired field service appliance technician.
You have an old unit. Some parts such as the door switch are no longer available.
You door lock should only engage when you are in the self cleaning mode. So you have a communications problem between the door lock and you control panel.
Latch Motor Substitution: 5304449471 Cost $180.00
Substitution: 316131600R Cost: $130.00
You may to replace one or both of these components.
Based on the cost of the parts and my service call experience you are looking at a $500.00 -$600.00 service call.
It's time for a new unit. Go into the internet and search; :Sears Outlet Store". This is a scratch and dent store where you can save several hundred dollars on a new unit with a one year warrantee.
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