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Reminds me on something Mercedes related. I know Porsche is different, but have you checked the relay contacts and the tray contacts of the relay. There is a lot of currency running when these SAI air pumps starts. So often the contacts in the relay melt which leads to misfunction.
Concerning Mercedes the SAI relays are located in a module called RCM module. The relays are mounted on a circuit board and the solder joints brake. But this is Mercedes specific.
Regards, Markus
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