wow- thanks guys for the replies. I have to dig up a diagram tonight and I will go the sump pump draining route. I will just jack the car up, put it on stands and go for it.
I *think* it is almost a quart over. I should have read on here to let the computer sensor to adjust properly. What I did was first add a quart as it said, then drove around and the sensor only went up halfway (the next day). So, I assumed I should put in another quart to get it to the top- this was clearly not the case. I topped it off again and the next day I got the warning, which was yesterday.
Again, thank you all for the replies!
2011 AW/FR Extended E92 M3... fully loaded