Take a look at the link below to an earlier thread where this is discussed. I'm also attaching a link to our site's DIY tech article on the clutch replacement - this should help you out with the procedure. Let us know if you have any other questions.
https://rennlist.com/forums/boxster-and-boxster-s-986-forum/637727-bits-of-plastic-in-oil-filter-need-advice-pics-attached.html
https://www.pelicanparts.com/techarticles/Boxster_Tech/44-TRANS-Clutch/44-TRANS-Clutch.htm