Buzzing in Earpiece

OK so this problem started yesterday I'm getting a buzzing in my earpiece of my iPhone. Almost like the sound if the earbud of a headphone was blown.

Anyone else have this problem? How do I get rid of it?

I'd plug it into another audio source just to make sure that it's the earpiece, not the iPhone causing the buzz. Then, assuming its the earpiece, I'd get a new one.

how do i get a new earpiece? Will Apple replace it if I take it to them?