Xbox Series X green pixels

I have a Series X on my bench currently that boots up perfectly and connects to everything. But when I get into game I get graphical artifacts in the way of green pixels popping up on screen. When I did a little digging I get a diode reading on pin 14 on the HDMI port of around .971 but that should be OL. When I disconnect the southbridge board that pin goes to OL and as soon as I reconnect the southbridge board it goes back to .971. Has anyone else experienced this? I initially thought APU but the weird diode reading has me think southbridge. Looking at schematics pin 14 does go to southbridge. I appreciate any help thanks