Sorry to hear about your situation, this may be a good place to vent but i doubt any PCNA executive has spent quality, if any time on this forum. What you may be able to find here is moral support and a knowledge base for others in your position. There are a few discussions in this forum that might interest you, here are two:
Poll: RMS and Engine problem questionnaire
Shortlived Boxster engines survey
And if you have not done so already, head over to Rennlist.com & Renntech.org. There you will find even more information and other experiences and recommendations on this subject.
Best of luck to you.