[BYprodriver]

Drgetz it sounds like you have basic mechanical skills so I recommend you maintain your Box personally. I don't know if you are a medical Dr. but due to the fragile & expensive nature of many of the engine parts in a Box, think in terms of a medical procedure while "operating" on you Box. Since you live on Okinawa I don't want to miss the opportunity to thank you for Military service if appropriate.
If you have Porsche service manuals you are well ahead of most Box owners & want-a-be Porsche mechanics. The Box is 20 years old so there is very little new info & virtually anything can be learned by using the search function.
The host of this forum, Pelican Parts ships overseas, so they may be your best source for parts.