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Hi, I recently bought a 2012 911 C2 Black Edition with PDK and have had the same message appear a few times. When it appears the transmission goes to 2nd gear and stays there till you turn it off. Once you turn it back on it works ok. After a few visits to the dealer, they changed the control unit last week but the problem resurfaced last Friday. Today they told me that they will change the whole transmission. Should I be worried moving forward with this? What should I expect?