Microphone Test Failure- Xperia Z3, D6603

HI,

Recently, when I call someone I can hear them clearly but they cant hear me. On reading about this fault I was informed that it was probably the mic, volume flex which was faulty and needed replacement as the mic is attached to this flex. Therefore, I replaced the flex with a new one, ensured that all the connections were secure but the fault still exists. I’ve run the diagnostics test on the unit and all components pass except for the mic unit (I talk into the mic for the test and I’m getting no playback). My loudspeaker is working fine as I can watch a video and can hear it clearly. I’d appreciate some help on this as I have stripped the unit down a few times without any success. What am I doing wrong?. Thanks in advance for your help.

Regards,

Martin