Hello,
My Whirlpool’s dishwasher motor squeaks when it stops. It sounds sort of like a rubber type of braking squeak. But as far as I know, there is no actual braking mechanism to stop the motor; the motor should just stop spinning.
It has been doing this for about a week now, so is not related to anything being washed. I am also confident that this noise is happening when the motor stops. I initially thought it happens when the drain pump starts, but that is definitely not the case.
I’ve been in there before. Unfortunately from the top all I can do is look for foreign objects as you suggest. Inspecting the motor and how it attaches to the sump has to be done from the bottom.
I’ll post back in a day or two if I find the cause.