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Where can I find a Headphone jack replacement fro a macbook pro non-retina ?? (pretty easy to find for retina but not for the unibody A1286 model…) Thanks

First please tell us why you think you need it. There may be a simple fix. It’s integrated into the logic board, see step #21 of this guide: MacBook Pro 15" Unibody Mid 2012 Logic Board Replacement