Remove the bottom panel and check for a slow water leak through the pump which could cause rust to the motor bearings.
In such case you have to order the pump & motor bushing assembly together with the pump seal/impeller kit.
If there is nothing wrong then possible a foreign object stuck inside the pimp.
- The part number for the pump & motor bushing assembly is
AP178769
- The part number for the pump seal/impeller kit is
AP178753
Here are the break down diagrams for the Jenn Air dishwasher
Model JDB3610AWX
Gene.