I've seen supercharger clutchs fail, but it's very unusual for the actual supercharger to fail, but i have seen them get quite noisy. Bearing noise is the only reason I've ever changed one and that's only when they're under warrenty.

I don't even know what a kompressor seal is, there really aren't any seals in these units.

do you have any more info on what they've told you and what they've checked so far

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Alex.

MB Tech
Sydney, Australia
Volvo 122S
W201 190D 2.5 manual
W202 C240
W203 C32