I've read through what Jake said and seen this issue discussed before. As I understand it, the part that is needed to fix this is the camshaft adjuster solenoid, not the wear pads.
This PelicanParts tech article outlines the procedure to do the repair:
Porsche Boxster Camshaft Upgrade / Chain Tensioner Replacement - 986 / 987 (1997-08) - Pelican Parts Technical Article
I have seen what
I think is the new part required on eBay for about $250. (Note bank 1-3 and bank 4-6 are different part #)
***$205 at Pelican Parts:
Pelican Parts***
...and the entire assembly used for $150.
I have two of these that I'd sell shipped for $35 each, but they are from an engine with 125k miles that was dead when I got it. Can't be sure they are good.
I saw your ad. GLWS