Where is the FaceTime mic located?

Hi Guys.

I have a client looking for an iPad mini repair.

The issue is when in FaceTime the person on the other end can't hear them.

We have checked usual is it muted ETC.

I know its in behind the camera at the top but i can't locate the mic itself.

Is it part of the front facing camera i have looked around for parts but cannot find anything at all so i'm kind of guessing its part of the camera flex?

I don't want to go digging around to find it without an idea especially on a clients iPad.

Any help or suggestions would be greatly appreciated thank you.