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Finding the broken flex is usually the end of the diagnostics part, and the replacement pieces are oftentimes fairly cheap.
For iPhone 6 home button flex cable repairers (Error 53) , or people who do not have the time to wait for a new part, I will include these following parts more as a curiosity than actually something worth doing as common practice. Unless you don't have a good reason (or enjoy it like I do) don't fix a broken flex cable. It rarely is worth it.