From the HRCA:
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Q: I understand that my dealer can take care of any situation relating to my Honda, but what if I am not happy with the service provided?
A: Yes, you are correct. Your dealer has skilled personnel who will be happy to assist you with any concern you may have. Discuss any unresolved issues with a member of the dealership management. Often these issues can be quickly resolved at this level. If your concern has already been reviewed with the Service Manager, then contact the General Manager or the owner of the dealership. We are confident of our dealer's ability to provide you with the highest level of service. If you wish to comment on your experiences with your dealer or your Honda (for USA residents and USA-certified products only), please send your comments to: American Honda Motor Co., Inc., Motorcycle Division, P O Box 2220, MS 100-4W-5B, Torrance, CA 90509-2220.
You may also telephone (310) 532-9811.
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That said there's another number (can't remember). Once the ticket is opened under warranty, it'll be logged under the bike's VIN.
Hugo