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Parts for Maytag MDB4709AWS1 Dishwasher - AppliancePartsPros.com

Do you have the tech sheet?
It is often taped to the back of the kick plate.
It shows the key/pinouts for the control panel.

From it with a meter you could figure out if the non working keys are actually bad or if the integrated circuit on the control board is bad.

The keys use common wires/tracks out so one track on the control panel ribbon cable will go to 2 to 5 keys.

Perhaps 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. 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.