My lower arm won't spin and I've taken the sump assembly apart. Looks like the check valve is not spinning from upper to lower spray arms? I rotated it by hand to the lower arms and it now works the lower only. Even when I start washer on upper only setting. I figure it's the motor since everything is clean and rotates fine. I found part #4681ed3001d as the motor. What else should I change out with it since I will have to remove the dishwasher? Any help would be great.

It has voyage. I may have got it wet during another repair? I ordered the motor, packing, and a new check valve. That should fix it I think? Thanks for the reply