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My son's first Miata had this exact symptom, clutch would not fully disengage when clutch pedal was depressed. Turned out to be a leaky slave cylinder. He was actually losing hydraulic fluid though. Our next thing to investigate would have been the clutch master cylinder (shared on the boxster with the brake master cylinder) - if the seals go bad then it can let fluid back into the master that should be used to keep the clutch disengaged.
Are you losing any brake fluid?
If you squeeze the rubber boot on the clutch slave cylinder (the part that flexes when the clutch engages/disengages) does any fluid come out? if so then it is a bad slave cylinder.
Steve
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