Go to our Vessel Examination Department's Vessel Safety Checks page at http://cgaux.org/vsc/
Towards the bottom, you'll see "Find an Examiner".
Entering your Zip Code will bring up the closest Vessel Examiners, from both the U.S. Coast Guard Auxiliary and the U.S. Power Squadrons.
You will be able to contact the certified Vessel Examiner of your choice.

All things considered, it's lucky that you found out via the Coast Guard, rather than an emergency, that you needed to update your boat's safety equipment.

This article was written by the DVC-UM on 1/16/12. It was believed to be accurate as of that date.  For official information, please refer to the Auxiliary Manual, COMDTINST M16790.1 (series), other applicable Auxiliary reference materials, Auxiliary Web sites and/or the appropriate Auxiliary chain of communication.