I have taken apart again
Cleared some nominal mineral deposits down to chopper blades.
I can twist the shaft and it does not appear to have any damage.
Is it necessary to pull motor up and out?
I cleared a mineral stoppage in the overflow pipe in the manifold (now water is flowing readily there.
When I first tested the DW this AM there was water coming through the lower arm about 3 inches high.
It then stopped and when I just retested there was no water coming through the arm.
As to the two points you mentioned, the water does touch the heater element however there were no "white washers" under the lower arm.
I appreciate your suggestions, where to from here?