My 04 had 63K miles, and one day while driving the clutch pedal became quite difficult to depress. It felt like my racing clutch in my old car. I had read about how the boxster clutch when it failed often became difficult to depress but this should have been a gradual change.
Wanted an excuse to upgrade the IMS so sent the car into my mechanic for a clutch and new IMS. At the same time time the clutch slave cylinder was also weeping so that was also replaced. Mechanic finished up the work and took it for a test drive and the clutch pedal still was overly stiff. Turned out the helper spring attached to the clutch pedal had broken. First time the mechanic had ever seen this problem. Could be your problem but I am not sure how you diagnose a broken helper spring problem if the clutch is in an unknown state.
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