How to enable the technician mode in diagnostic on GS4 JD display

How to enable the technician mode in diagnostic on GS4 JD display. This will allow you to do steering calibrations and valve calibrations within the XSC controller for guidance problems or issues. This will also help you aid you in troubleshooting the JD steering system.

[@sphillips8362]

Any info on pinpointing a sudden onset with canbus not communicating with controllers which throw many subsequent codes for the various controllers?

[@PRPSest2001]

Hey I have a 2014 John Deere 621R Im looking for the Address for the rear fender/beltline to activate the LED lamps I have fitted I can get into tech mode but I’m not sure what address to go to?