I'm in the same boat, but only my left side stopped working. Switched to my backups (My old SE530s) but man I miss my TDK's right now. I'm over a year in the warranty and waiting for their support to get back to me. Hope we can both get ours fixed. Don't know if you need to mention that though.
Anyone have experience dealing with TDK and their repair/replacement department?
Not sure if you figured this out by now but I was in the same boat. My right side stopped working a few weeks ago, and of course after purchasing new IEMs I just came across a thread here on the extension cables going out. Sure enough when i pulled off the extension and plugged the cord straight into my comp the right side works fine. You may try this if you haven't already.