The slave cylinder has been known to fail, afraid you are looking at box out to check it so may as well renew it and the clutch while it's in bits. The dual mass flywheel I would carefully assess before going to the expence of changing but it's a 50/50 thing as it's a box out again job when it fails and with 99k on it how long will it last.
I understand it's a 4 or 5 hour job at volvo with their gearbox cradle, so look at your local hourly labour rate for cost. Go to local garage and ask them to quote for the job or diy, both the latter options will probably take longer than volvo without their gearbox cradle.
Paul.
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