I would have thought ISV (ICV) too, had a problem exactly like that with a 964 that was solved with a replacement. But you have already checked that, so I am out!
I have to admire a guy who asks the rest of us for advice on a truely unique machine!
I wish I had an answer.
Cheers
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Turn3 Autosport- Full Service and Race Prep
jeff@turn3autosport.com
997 S 4.0, Cayman S 3.8, Boxster 2.7, Boxster S race car, 996, 955 Cayenne TT, 958 Cayenne TT
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