I have a Kenmore 665. 17772 Ultra Dishwasher. The manual states if the "lock light" flashes either 2 keys are stuck or a key without a light is stuck. The only key that I know of without a light is the "Start" key.

Do you have any suggestion short of replacing the key pad assemble?

You will find the solution here: https://www.youtube.com/watch?v=zex_g2TJRl4
https://www.youtube.com/watch?v=c6t60XHeSUc
https://www.youtube.com/watch?v=flzhfmIIYpM
Manuals: https://dl.dropboxusercontent.com/u/8010163/Electrical%20Theory%20and%20Diagnosis%20of%20Major %20Appliances%20Service%20Manual.pdf
https://dl.dropboxusercontent.com/u/8010163/How%20to%20use%20Test%20Equipment%20Service%20Manu al.pdf
https://dl.dropboxusercontent.com/u/8010163/Kenmore_Ultrawash_Dishwasher.pdf
https://dl.dropboxusercontent.com/u/8010163/How%20to%20Fix%20a%20Flashing%20_Clean_%20Light%20 on%20a%20Kenmore%20Dishwasher%20_%20Home%20Guides% 20_%20.pdf
You will definitely need a good digital multimeter before you will be able to fix this appliance because you cannot see electricity or inside a circuit. Home Depot has a good clamp on meter for about $42.00.