Hello! Thank you, in advance, to any help :)

I have a Kenmore Elite slide-in, dual fuel range that I purchased just under 5 years ago. For the past week, the oven fan doesn't shut off on its own. The other night it stayed on all night! When I shut the oven door too hard, it did go off. But tonight it wouldn't shut off. I turned off the breaker for 5 minutes and that did the trick.

Where do I begin to troubleshooting on my own? What parts am I looking for?

Thanks!
John