[Britwrench]

This is when you fnd out the previous owner didn't replace all the clutch parts like he told you.

Take it out and carefully check the release linkage. The shaft, bearings and lever must be in perfect condition. After cleaning them lube all the parts with the correct PORSCHE grease.

There must NOT be any grease on the guide tube/release bearing. See the tech bulletin that applies.
I would suspect that the guide tube and release bearing were greased and are seizing up due to dirt accumulation.