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The noise might be coming from your primary tri-zone control, which is basically a 3 way diverter valve. I would try taking it out and re-inserting it and see if that helps. It's simple to do. The lever will actually pop right off and the circular piece around the lever that has a 1-2-3 zone label on it will unscrew. Whatever is causing the noise, it's most likely going to be an easy fix and should be nothing to lose sleep over.
How much did you pay for your epic - I am going to look at one myself and want to know how much I should be paying for it.
If you leave the jets on while you do that, you'll get to see the secret secondary waterfall feature