WhirlPool doesnt completely drain

I am a maintenance man at an apartment complex and I am noticing this trend with all of our Dishwashers. Here as of late it has been happeneing quite frequently.
The dishwasher will cycle through but when it is all done there is still some water sitting in the bottom. It isnt a lot but its more than should be there.

Any ideas or suggestions?
I have replaced both the motor and the pump in the past and it did not resolve the issue.