Leaderboard

These are the four (4) traces running along the front edge on the bottom side of the motherboard. IIRC, the outer two carry the power and eject button signals respectively from the front panel to the always-on System Management Controller (v1.0-1.5 - PIC processor or v1.6 - custom Xyclops chip) and the next two are the green and red front panel LED control signals to drive transistors that turn on/off the eject ring LEDs. For information on troubleshooting, see http://diy.sickmods.net/Tutorials/Xbox1/Power-Eject_Pinouts/

I know MVG on youtube has got one of these, that is the only time I have seen a debug kit.