Firstly I am pre facelift and recorded all my control unit data here
http://obdeleven.proboards.com/thread/3262/control-unit-setup which is easier to look through using find.
With regards to Front Differential Lock have you looked under control unit 03 - Electronic Differential Lock, I have not used it so no idea what it shows.
under control unit 19 - gateway you have the following that may
help
Driving profile selection, system status
Status, driving profile selection for A/C
Status, driving profile selection for adaptive cruise control
Status, driving profile selection for ambient lighting
Status, driving profile selection for belt tensioner
Status, driving profile selection for damping adjustment
Status, driving profile selection for engine
Status, driving profile selection for external noise actuator
Status, driving profile selection for free-running hub
Status, driving profile selection for power steering
Status, driving profile selection for start-stop function
Status, driving profile selection for structureborne noise
Status, driving profile selection for transmissionDriving_Profile_Selection_C oordinator_BAP_State
Driving_Profile_Selection_C oordinator_Retry_State
Driving_Profile_Selection_D river_Operations
Driving_Profile_Selection_F unctions_Master_Preliminary
Driving_Profile_Selection_S ystem_Substate
Dont know if any of these will
help you