Just out of Warranty Oven

The LED read out on my oven dosen’t work so therefore my oven won’t come on. It did this 1 other time months before. The WPool helpline said turn the breaker off allow the oven to reset. That didn’t work at the time. It was left off for a few days when turned back on it worked briefly. The light comes on when the door is opened but the LED will not show.
this is the diagram of possible parts to be replaced. Wondering if it could possibly be bad connection, how to check, or how to get in and replace
http://www.appliancepartspros.com/partsearch/frame_diagram.aspx?diagram_id=958851&&model_id=5134554&NewWindow=1

It just came back on had not self-cleaned the oven. It make’s a beeping noise all the time.

If the LED is out and not responding to key inputs, the the control board (AP3595759) is the logical failure. The display is part of the board along with all logic so it controls everything in the oven.

There is a Control Panel Ass. & a [B]Electronic clock control board[/B] how do I determine which it is.
Is this something I can just snap in, or should I have a repairman fix it