Sound issues even after installing new parts

Hello,

After seeking advice regarding my issue with regards to loss of being able to ear people whilst on a call,

Its been determined after replacing all the internal parts and still having the fault and Apple stating there is no software issues with the unit, its deemed that the fault lays with the motherboard itself,

I installed an app on the phone called Phone Doctor, run some tests and it failed on 2 sections of the test,

1 - Earphones and Mic, result beneath

Low Frequency 300Hz - Passed

Med Frequency 2000Hz - Failed

High Frequency 8000Hz - Failed

S-High Frequency 12000Hz - Failed

''2 - Receiver and Mic, results beneath

Low Frequency 300Hz - Passed

Med Frequency 2000Hz - Failed

High Frequency 8000Hz - Failed

S-High Frequency 12000Hz - Failed

Everything else passed the test,

Could the result of the above be caused by a chip under the EMI Shields and if so what chip is it and where can it be located

Thank you in advance for your help

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