KitchenAid K5SS Heavy Duty Commercial Stand Mixer "325w" Questions

So I shreded the nylon gear in my K5SS 325W. How So I shredded the nylon gear in my Kitchen Aid K5SS 325W. How can I tell if the motor control board is bad as well? Motor makes no noise when the speed

My wife's Kitchen Aid Artisan 325W mixer has no high end speed. I tried a new set of brushes with no change. Then starting on speed 1 to 2 and from 2 to 4 you get a nice speed increase the speed ...

The KSM150PS 325W mixer does nothing until speed control is moved up to position 8 or 10. Then when repositioned back down to say 6 it may run for a moment but then stops. It might just click on ...