Emergency Gearbox Cayenne Diesel

Day together. Maybe one can help me further… I bought a 2012 Cayenne Diesel, which was only waiting for Porsche a week ago (220,000km). A few days without problems short distance, then drive to Spain, where it is to be registered. After 1,500 km trouble-free run comes the message “Griebe Emerglauf”, but the gaiebe works quite normally all the gears up and down. I turn off the engine, again, everything paletti. I typed on either pure false alarm or much slightly low oil level in the transmission (should be changed at 240tkm according to the maintenance plan), because errors only occurred after long driving. After arrival and a little short distance (was everything cold again) message comes back, but now always and also in connection with moror control light (only increased idle speed, drives and switches normal). Question: With the error picture someone has a guess? As said before and after perfect clean switching, no jerking, nothing. Should I go to Porsche for reading out error memory, or exchange the first time on suspicion control units for a few thousand euros 🙂 Although here have a workshop with really good “old” mechanics, who can still disassemble engines and have my full confidence, do not believe that the e.g. error memory can read out from the thing … Maybe not a good idea, when the “first open and look”?? Thanks for your help!!