That may have been my situation that you read about. I had the new gear shift installed in early Jan.
Of course, the "Trans. Malfunction" error popped up again Wed night, so into the dealer my 535 went on Thursday morning (yesterday). PuMa case has been opened, and it may need an new transmission. Still waiting to hear from them today as to what the problem is, although they did find some codes (I'll post those when I get them).
Friggin' car doesnt even have 50k miles on it.