i recently left the trade but when i was there 6 months ago a customer needed one servicing, cannondale wouldn't let us have any spares for it and insisted we send it back to them in the netherlands (european distributer) the reason was they themselves had very few spares having not made the fork for some time and were repairing them by using 2nd hand bits here and there and by, for want of a better word, botching them back together with mixed model parts. i should point out that the fork itself was perfectly servicable as any lefty it was just the cartridge that was an issue due to the specific components between the electrics and the cartridge itself.
the shop i worked at was GA cycles in southampton, if you want some honest advice about the forks ask for gary, he's the boy with lefty forks and headshocks but i know he is running low on parts now as they aren't a cannondale dealer anymore (because they are hard to deal with)
i have heard there is a guy advertising on ebay though for servicing but don't know how good he is but claims to do all models.