Hi Van,
I have a 2014 model of the same TT and I have the same issue with the water pump noise but mine is intermittent.
As for accessing the pump. There are 2 brown screws hiding in the carpeted lid of the platform. One on each side 1/2 way along the front and back,.... if that makes sense ;-) I was surprised how hard they were to find as you have to probe around in the carpet pretty well.
Hope this helps,
Lee
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