Accuracy International AX50 Trigger Adjustment Question.

[338LM_Sniper]

I have an Accuracy International AX50 and it has the Factory 2 Stage Trigger. I was just was wondering if there is a PDF or video on how to adjust the 2nd Stage to a lower setting? I don't see anything out there on the web so your input would be very appreciated.
This is an earlier 2016 AX50 and not the newer AX50 ELR version if that makes a difference?

Thanks in advance.