Hi,

MDB121RFM2

A two motor d/w, one for washing and the second for draining.
These don't have a chopper blade.

no longer circulating water. My wife reported it making a lot of noise, and the dishes were not cleaned well
The wash impellor breaking free from the motor shaft is common and the wash pump cannot push the water around properly for the washing and we get an odd noise...
http://www.applianceaid.com/154291504.html

Access to the rear of the DW is limited for now (due to a laminate floor going down on top of the old floor, so the DW won't slide easily out… ).
Can normally ( power off ) remove the whole motor and pump housing up through from the inside to R&R the motor.

If needed:

image
Wash motor & pump kit- Motor not sold separately. Use this kit. One housing for units with a upper spray arm, its hose connection is open. Other housing hose connection is sealed