Hey guys, I have a have Haswell 13" macbook air, and recently the left speaker stopped working. I confirmed this by playing music and then using the Left-Right Balance. When the balance was on the left, the music was inaudible, but when the balance was on the right, it played fine from just the right side of the mac. Im going to bring it to Apple as soon as I can, but is there any way that this is just a software glitch so I can save a trip? Any tips on what to try?