Dishwasher slowly fills with water

My Whirlpool Gold, Quiet Partner III dishwasher (Model: GU1100XTS1) slowly fill with water after a wash cycle is complete. If I press the ''Cancel'' button, the water will all drain out.

I would like to try and fix this on my own rather than having a service person come out. I suspect that there is a fill valve of sorts that is not closing completely. How can I verify this for sure? And, once I've isolated the problem where can find the part numbers, purchase the parts, and I find a service manual to help me with the assembly?

Thank you for any assistance!

Greg, at this link you can download available manuals for your unit.

Good luck with your repair.

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