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Lumia 635 Audio and Mic Not Working, how can I get it working?

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Windows Central Question

Lumia 635 Audio and Mic Not Working

My display broke on the first instance of fall and I bought a new digitizer assembly from amazon. After unsuccesfully trying to replace it myself, I went to a local repair shop guy who replaced the display. Phone display touch and other sensors are working perfectly fine except for speakers and mic. Service guy checked the entire circuit and confirmed that all voltage and specs are working as expected and he's not sure on why the audio is not working. I installed W10 Tech preview and nothing changed. Tried to use hardware test apps and they just force close whenever i try to test speaker or mic. Any suggestion to fix the issue would be of great help. thanks in advance