When these came across my desk, only one side worked. YOU KNOW HOW MY MIND WORKS, so I decided to attempt to repair them. I did some research and thanks to @samroesch, I found out you could break these headphones down (here). One the wires were crimped. Since the crimp was near the top of the cord and the cord is long, I figured I could cut and re-solder the wires to the speaker. Below are the tools used.