This was posted on the Zenith.aero blog about the upgrade:
"I've just heard from Doug and Lori Dugger of Quality Sport Planes (in
Cloverdale, California) that they will host a free "Upgrade Workshop" during
the upcoming November 20-22 weekend. This is one more way for Zodiac XL
builders, owners, and pilots to get assistance with the new upgrades
required for their aircraft. For more information, contact Quality Sport
Planes. RSVP to (707) 894-4084. Thanks Lori and Doug for hosting this
workshop!"
I found this confirmation on QSP's web site:
http://www.qualitysportplanes.com/qsp-2006_004.htm
Doug Dugger will be doing the work on his own XL.
-- Craig