Unfortunatley with any "exotic" you need to be careful. Porsches are cheap to maintain. Not much to a box 6 with a couple of turbos hanging off the back . I drive em and race em and I can tell you its not what you know but who you know when it comes to mantaining a Porsche

Lots of people get laid away on these cars all the time. 10K for a tranny... someone was showing you no love at all !!
Just be glad you didn't have to buy a "real" Porsche tranny like this one