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Can the headphone jack on the macbook pro 2018 with touchbar be replaced if the jack becomes loose? I’ve already found the parts on ifixit but it is labeled for macbook pro 2016-2017. Thanks in advance!

That machine is covered under warranty. If you attempt repair yourself you will void that warranty. Just take it to Apple. UPDATE The audio port is integrated into the main logic board. Repairing it would require miro-soldering skills.