I got this off the Yamaha site. Perhaps you could try using this:
DUG is an informal organization for Disklavier owners and users. Members include Disklavier enthusiasts from all over the world, including employees of Yamaha.
You can stay in touch with DUG by subscribing to DUG's Internet email list. When you subscribe to DUG, you will receive all email messages sent to DUG's Internet email list by fellow members. You can respond or not, as you wish. On some days you may receive several messages; on other days you may receive no messages. It all depends on whether there are any hot topics being discussed at the moment.
You can subscribe to (or unsubscribe from) DUG by sending a message to:
Put one of the following phrases into your email mail message. Be sure to substitute your actual email address (e.g. firstname.lastname@example.org) for the part which says "your_email_address":
subscribe dug your_email_address
unsubscribe dug your_email_address
Once you have subscribed to DUG, you can send email inquiries or comments to the entire DUG membership by addressing your messages to:
Please do not send subscribe and unsubscribe messages to email@example.com.