If you can get the camshaft deviation values, get them. Likely from Durametric or a porsche tool. Camshaft adjusters lie in between the camshafts.
Getting that out means removing the valve cover, locking down the timing with a special $184 tool, locking the crank, removing camshaft bearing caps, removing the sprocket from the camshafts, then removing them both. You'll then replace the adjuster, which will cost around $1,500, and after that you reset the timing in respect to the two camshafts, put them back in the car, set the timing in respect to the crank, and drive.