U3415W Buzzing Noise

I have a U3415W (REV A01) and it makes a buzzing noise near the bottom of the display, near the Dell logo. This buzzing noise changes depending on whats on the screen, is this a defect? Would I be able to RMA this monitor based on this problem? Also if I were able to do that would I receive a new unit from Dell or a refurbished one?

Thanks