The dock connector microphone problem

Hi,

A customer brought an iPhone 6 to me and saying when he makes a call the other party doesn't hear him well. The voice is low and muffled on the other side of the call.

So I thought I replace the dock connector flex and I did but it's still the same. The voice recorded on voice memo is also lower than what it should be.

What else could be causing this if not the dock connector flex?

Thanks in advance

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