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

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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.
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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?

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

sphillips