I bought a house with a Jenn Air also but mine is a combo downdraft cooktop/oven. I had to replace it this summer and new ones are $3000.
Being cheap when it comes to appliances I found a really nice used Jenn Air on craigslist for $200. I read the reviews on the newer units and they are bad.
Sure enough the oven stopped working. Figured out it was the control panel and it cost $250. Didn't have problem getting one multiple vendors online had the part