I woke up this 2 days ago and my oven display is not working. When I press a button, the oven beeps, when I try turning on the oven, I get 2 beeps, then 3 beeps. A day later, the display was working an said E6 E2. I guess I need to know what to test to see what needs to be replaced. I see the control board is discontinued but can be sent in for repair. Any advise would be awesome.

Here are your parts
Parts for Whirlpool RBD276PDQ11 Oven - AppliancePartsPros.com

See the attachment for the tech sheet.

Not sure about the error codes you give are you sure it was not F2 E6, see the tech sheet.

Looks like a keyboard problem.
There is not a good way to check thee keypad as they do not publish key/pin-out info.
I would try the following and if that does not work then replace the control panel/keypad. This is a gamble but you do not have another option.

Connector Cleaning / Checking
Unplug the unit
Open it up
Remove the ribbon cable from the keypad to the control board at the control board.
Clean the edge connector. Use electronics contact cleaner or isopropyl alcohol.
If it is the type where there is not a connector just the insulation is removed, it can be cleaned with a pencil eraser. Do not use an ink eraser as it is too abrasive.
Check the tracks in the ribbon cable for hairline cracks. A magnifying glass helps here.
Would not hurt to clean the connector on the board. Use electronics contact cleaner or isopropyl alcohol and a tooth brush. Be gentle and do not reconnect till all the solvent evaporates.
Reconnect everything and give it a try.