Yes, yesterday I emailed Denon Spain about this issue. No answer yet.
Thank you very much, fellow countryman
Thanks. At first, I contacted to the shop where I bought them in December and they said to me that the only way to claim the warranty was to go to a local technical service that manages with TVs, sources, DACs or AMPs and all other electronic things... (I don't know if there are shops like this in Singapore, I suppose) and resulted to be an authorized Denon technical service.
Firstly, the local shop checked if the on-line shop where I bought the 9200s is an authorized Denon dealer (if not, I couldn't claim my warranty), and afterthat they told me that they have to contact to Denon Spain in order to know if my headphones are repairable or exchangable with another new unit.