Sounds like the SAI and its supporting circuitry work fine.
I would chase the sensors that are used to determine whether the SAI should be run. Its only activated when then engine is cold.
I'll do a quick check of the Porsche repair manual in the morning.
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2004 Boxster S Silver - FUNTOY
2002 Boxster Base Guardsy Red - FUNBOX
1987 Caterham Super 7 1700 Supersprint
2009 Mercedes Benz CLK 350 convertible
1941 Dodge Luxury Liner Coupe
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