My Whirlpool GS773LXSB0 gas range/oven stopped working last night while cooking food for the holidays. The burners on top work, but the oven and broiler do not.

When I turn it on bake or broil, it just says preheat for a long time but the gas valve never turns on and the ignitors never click. I am suspecting either an open thermistor or a control panel have failed. Any sugguestions on how to test this or what else could be the cause? Is there anything else aside from a temp sensor being open that would shut down operation of the oven or broiler?

Thanks!