Hi, I have a GE dishwasher. Model number PDW 9280N20SS. I have to replace part 507 on your motor-pump mechanism schematic
(http://www.appliancepartspros.com/partsearch/model.aspx?model_id=5210672&diagram_id=26851328#d26851328)
I’ve removed the lower wash arm. How do I remove parts 454 and 450? Thanks