Here are your parts. Note the unit has B and W models
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Here is a service manual
http://www.servicematters.com/m...ibrary/docs/16010191.pdf

First unplug the unit for 5 minutes to see if it will reset.

From your description I would say at minimum you will need a keypad (Switch, membrane) to repair the sticking Button 5
May also need an EOC (Electronic oven control assembly) to repair the no shut off problem. Not sure what panel lights you are referring to so check the wiring diagram to see what controls them.

May be worth giving the below a try
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.