Frigidare oven Help

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I guess my oven is kaput…
I tried to bake some potatoes and after 50 minutes they were still rock hard and I could hold the potatoes with my hand.

The oven/stove was purchased in 2004–but I do bake/cook alot…So I guess
the thermostat is OUT…

I wonder what it would cost to have someone come and replace it…
I have to idea where the thermostat is!
Inside the oven or on the knob???

Or is it just better to buy an new oven/stove??? IDK
Help–please and thank you

A model number may help others help you.
http://www.appliancepartspros.com/modelnumber_locator.aspx