Hello, I have a Toto Promenade toilet. Whenever the toilet is flushed, a relatively loud whirring noise occurs which gets increasingly higher in pitch until the noise ceases. This lasts for less than 10 seconds, and sounds like it is coming from the plumbing below the floor of the toilet. Would anyone happen to know what might be wrong with my plumbing? This plumbing and toilet are new in my remodeled home (less than 2 years old).
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