Kohler WaterHaven Leaking Problems

I have a Kohler WaterHaven shower tower that started leaking. When I turn the water off it drips out of the main shower heads. When I turn the selector for the hand shower, It makes a gurgling sound then starts to drip out of the hand shower. I've looked at the parts list on the Kohler site but I'm not sure what to replace.
Does anyone have any experience with this product who can steer me in the right direction?

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