There was a Wheeler Dealers episode that featured a Boxster with a problem tiptronic transmission: https://www.youtube.com/watch?v=oS_yKQRcln0
If you haven't checked for this problem already, it may be worth a shot.
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2000 Arctic Silver/Black, Hard Top, On Board Computer
PNP Rear Speakers, HAES 6-Channel Amp, Avic Z140BH,
Painted Bumperettes, 2004 (OEM) Top, Homelink integrated in dash with Targa switch, 997 Shifter, Carrera Gauge Cluster with silver gauge faces, heated 997 adaptive sports seats, Litronics, silver console
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