My Wolf 30 inch wall oven is almost 4 yrs old. When I open the door, the light doesn't come on. When I press the button to rotate the control panel, it does rotate but nothing lights up on it.

I have shut off the main power to it in my breaker box in the basement and then turned it back on to no avail.

I'm afraid it's going to cost a fortune to fix. I hardly ever use this oven.

Any advice?