I talked to my SA today and she said that they still haven't found the problem and are going through the PUMA process. They have taking pictures of the valve springs and valves to send back to BMWNA to help them diagnose the problem. No definitive answer of the problem. Oh and the engine is officially out of the car! Why they had to take it out I don't know but I have read another thread here with about a member who had a valve spring problem and they didn't have to take the engine out. Obviously I'm not an expert though.
2013 E92 M3
Space Grey/Fox Red Novillo