Here are your parts
Replacement parts for WHIRLPOOL KUDK03ITWH0 UNDERCOUNTER DISHWASHER | AppliancePartsPros.com

See the attachment for the tech sheet.

See the second page in the tech sheet for the keypad matrix.

The two bad keys use P1-12 as a common but there are other keys that also use this line so check if they are working.

The problem can be caused by the control panel (keypad) or the control board.

The usual way to trouble shoot this is to check the keypad with a meter if it checks out OK then replace the control board.
Still a bit of a crap shoot but your odds are better.

If the other keys using P1-12 also do not work you may want to try the following.
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.
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.