HE-X4 right ear no sound, repairs possible?

I got my HE-X4 from drop and after 5 minutes of trying it out, the right channel stopped producing any sound. I've tried different cables and devices, so it's definitely an issue with the headphones.

Asked for a repair / replacement from Drop, they told me they don't have any spares and gave me a refund instead.

Is there anything I can try to repair this myself?