While I haven't experienced this in the Boxster, I have seen in previous Porsches vinyl dash's that crack, split and "swell". I attibute it to sunlight/heat and the drying out of the materials as they age. Not sure there is an easy/simple solution to reversing the damage, short of replacement.
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1976 914 2.0
2000 Boxster 2.7 (sold)
1978 911 SC (sold)
1970 914 w/2056 (sold)
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