Seems as though this can be caused by something as simple as a seat belt that needs cleaning.
Might be worth a try before digging into the mechanism...
Link
https://www.youtube.com/watch?v=8XL8QbooM84
I can't believe how much grunge came out of this guy's seatbelt. 
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'01 Boxster S (purchased new) triple black, litronics, cruise, heated seats,18's.
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