I read that other GE microwaves had a "kit" that had the Mag., diode, and stirrer assy.'s .... the mag and diode are straight forward swap, but is the stirrer assy.'s as in the plates in need of replacement also seeing that GE had a kit for other models that included this? One thing I did notice is that this unit has 2 of these stirrer plates. I do not know what would make them bad. Is there a way to tell? Arc burns etc.? The unit works great otherwise without any weird noises.