Barely worth mentioning, but this was my first up-op as SEN (had about a dozen as UA*G over the course of the last 10 years):

09SEP DUS-MUC Y->C thanks to a nice flight manager:

She rebooked me on an earlier flight (2 hrs) despite the fact that it was a Y-Fare that required the €60 change fee and I got the op-up to C. I guess that my original flight was heavily overbooked (I only got a reservation on this flight using the SEN guarantee).