Maytag MDB7100(AWQ) series makes a grinding noise when draining?

I took it apart as far as possible without removing it from under the counter to see if there were any obstructions. I found a plastic BB and a small rock. After clearing everything out, I reassembled it and started the Drain Cycle.

I heard a little water drain out, but the grinding noise started again. The lower "ARM ASSY., WASH (LWR-GRAY)" was BARELY turning clockwise when I opened the door.

Should I attempt to replace the "MOTOR&PUMP HOUSING ASSEMBLY" or do you think it could be something else?

Any recommendations would be greatly appreciated.