Go checkout www.ferrarichat.com and look at the Northern California thread. Do a search on Bob Willis (I think). I haven't used him but everyone raves about his work. I think, however, he is down in the Gilroy/Morgan Hill area and has just opened a large new shop.
www.clubsportiva.com has an in-house guy that does a great job. Contact them and let them know I referred you and you'll get preferential treatment. You could ask for either Jeff or Mark, their number is 415-978-9900 and they are located just two blocks from the Mascone center.