Thanks for this! I am planning to do this soon.
Just an FYI for people, there's a large portion of the old tranny fluid in the lines, pump, and cooler. To truly change it all, the pump has to be activated. From what I understand, the method in this DIY only drains something like half of the fluid in the system.
2008 IB E92 M3| BBS | KW | Arkym | Platte Forme A.G. | Active Autowerke | K&N | Fabspeed | Dinan | Evolve-R