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master plumber ( or anyone) maybe you can help me….

I renovated my first floor apt and put in a new bathroom w/ all new plumbing.. We’ve been there for a year w/ no problems.. Now, when we run the tub/shower we here a high pitched “whistle” that sounds like it is coming from the pipes behind the wall.. Sometimes, even after we turn the faucet off, the sound continues for about a minute.. Is this a serious plumbing problem???

thanks for your help…