Sorry, I posted this question in the wrong spot in the forum previously. My diverter valve is leaking and I can't seem to determine how to take it off so I can replace or repair it. Any thoughts? The spa is a Windriver HU-E-15. Pictures are below of the leaking diverter valve. Specifically, I can't seem to figure out how to remove the top knob above the shell.

Thanks for the help.

FYI for those facing any similar problem. I finally discovered that there are 2 screws in the holes of the knob that require allen wrenches to remove. Once loosened, the knob comes right off giving access to the mounting screws for the valve below.

Thanks again to all who help with the forum.