I need to replace the torsion spring (Kitchenaid part #4451009) in the door of this microwave. I could use help on how to disassemble the door to replace this spring. Does this unit need to be removed from the cabinet/wall or can this repair be done in place? How does the door come apart to get at this spring? And are there two springs or just one? The schematic drawing from Kitchenaid is not very clear.