Hi, its possibly the float gasket that's worn out and leaking water.
Here's the float gasket for your model:
WP8531743 Gasket
There is a video in the float gasket part link to replace the float gasket, and it also shows you how to remove the float to see if its broken underneath it. Now the video tells you remove the entire dishwasher, which I never do when I do this job. I just remove the outer door panel to get more room under there. To remove the door panel just remove all the torx screws inside the door, then the outer door panel lifts up and out.
Here's the float for your model:
Float WPW10195036
Let us know what you find.
Jake