I just finished a Colgan class. We did indoc in Memphis, but everyone in my class interviewed in Minneapolis. A recent 9E hire would have to confirm but I believe their interviews are in Memphis.
As far as I understand it, there was one Colgan class behind mine, and then everything from here on out was supposed to be Mesaba classes. This was before though, when the Colgan planes were getting moved onto Mesaba's cert. Now that it's the other way around I'm not sure if their plans have changed.