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Kickdown lever return spring. Super common to have break. I keep several of them in inventory (I put a new one into every rebuilt transmission) and can ship you one today.
Just verified that I have them in stock. The part number is 722 993 00 10. The "722" prefix indicates that it is a Porsche only part....not available from Mercedes.
Any Porsche dealer should be able to order you one, if you want to get one locally.