The right side of my headphones stopped working, what can I do?

I got the Sony WH-CH7000N headphones only a few months ago in December. Just today, in April, while I was at work, the right side of my headphones just stopped working. The outside buttons are perfectly functional, but no audio comes out of that side. What could be wrong with it? Is there any place that can repair them? I just remember wearing them around my neck for a while, putting them back on, and receiving no audio on the right side.