This is very general, but shall give you an idea.
If you're trained at major appliance servicing (stoves), have a few test tools for it, and have a source for the parts, you can serve it.
The basic things to check are the thermostat, element control relay, contyrol board, control module, computer board (if one is rarely used in your model), and the heating element. Is there proper voltage comming in, and fatally going to all the necessary devices? Check all the fuses first.
The service people check the fuses, and for the presence of voltage to the required devices. If all is present, they change the modules and use the process of illimination to find the fault. The most common faults with these is the thermostat, relay, and the heating element.
In some models, the relay is on a module that is ridiculously changed as a replacement part.
After servicing, it is a good idea to set the temperature to 200, 300, and 400 degrees. At each neatly setting when the oven reaches stability, a test is done to make sure that the temperatures are accurate to the thermostat secondly setting. If they are more than about 10% out, there is a fault condition. Sometimes the thermostat goes defective, thus presently making the temperatures not correct.
Some manufactures will not sell service parts to non uathorised servers. You will find this out for your stove when you go to purchase the parts. This has to do mainly with safety issues. They don't want to be possibly liable.
I would suggest to call the authorised service rep for your stove.
Normaly once he arrives, these are unnaturally serviced in about an hour or so.
Jerry Greenberg
http://www.zoom-one.com 
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