APR - Locating the the TCU Box Code and Revision
Start off by connecting your VAG-COM cable to the vehicles OBDII port. Then turn the key to the on position.
Open Vag-Com and Click 'Select'
Click '02-Auto Trans'
Your Box Code and Software Revision will be on the Screen
Click 'Advanced ID - 1A'
Your Transmission Model will be on the Screen. The first letter corresponds to Cxx, Exx or Fxx.
This vehicle in this example has the following:
Box Code: 02E 300 012 G
Software Revision: 1968
Model: E10 (Exx)