Can the microphones be replaced independent of the board they are on?

My phone screen froze up on me and wouldn't turn off. So I took it to a friend who worked on I phones to try to get the battery out to see if it would reset. Well this idiot thought the two small holes at the top and bottom were where he was supposed to shove a pin into to release the back. So he destroyed both mics. When I'm talking nobody on the other line can hear me. So I need to know if I can order replacement mics and repair it. Love the phone! Hadn't had it a month when this crap happened.