Get a Copy of the Repair Part List of your model from Kitchenaid.com.
Most likely it is the Worm Gear (17) grinding at low speed the Worm Gear Follower.(19)
You don't have to replace it now, but it is best to open the Transmission Housing and
inspect all the gears conditions. Clear all the grease to expose them. The Bevel
Gear (21) sits right on top of the Worm Gear Follower. (See Repair Part List)
If its teeth look sharp and all metal shiny, then that is the source of your noises.
Eventually, all the teeth will be chewed away and the planetary assembly will stop turning.
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