I had a very similar problem that was diagnosed as a faulty multi-function switch in the transmission. Now runs sweet as a nut, but I have noticed that is still starts in 1st and will change to 2nd after a short delay footbrake on or off. Whether that is correct or not I don't know, but it happens every single time so it seems to be on purpose.
Apart from the Porsche main dealer taking 3 days salary for a 3 hour job I'm really pleased with the work.
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