I don't know this specific tub, but here's the pictoral. The button (90105) should come out of its base, held by friction of O ring. This should allow you to disconnect the pressure line. If you are looking to replace the complete assembly, likely you will need a basin wrench to reach nut (65157).
Here are links to Kohler, specific to this tub.
https://www.us.kohler.com/us/catalog/svg_viewer.jsp?productId=415928&diagram=3
https://www.us.kohler.com/webassets/kpna/catalog/pdf/en/1010564_5.pdf
SOURCE: The air pressure switch is bad, motor is still
Check for an air switch at your local hot tub store
take the old one in so they can match it up to a new one
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