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  • Sounds like expansion / contraction is going on. Replacing - probably not but I would have a qualified HVAC guy look at them to see if things were done right & ways to minimize it / or sound transfer

    As for cleaning - cleaning ducts is worthless in most cases: http://thehtrc.com/2018/duct-cleaning-waste-worthy-faq

    FAQ on Duct Cleaning: All Hype or Worthy Expense?
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