Robert,
You missed "0" when you posted the model number first time.
The display board (aka clock) is not too difficult to replace yourself. Remove a few screws, holding the control panel. Unplug the touch pad ribbon from the clock. Remove the four screws, holding the clock. Remove the wires and/or plugs from the old clock (one at a time) and connect them to the new one.
- The part number for the display board is
AP367514
Here are the break down diagrams for the Jenn Air oven
Model WW27430P
Gene.