2015 Tahoe LTZ instrument cluster ground location?

[BlaineBug]

Just the codes relating to tire pressure, side traffic sensors. Dealer tested and all are fine. Initially all cluster gauges are wacky, turn signal not working, break light is still on, and gear light on cluster does not show the right gear. Car still runs fine and cluster if OK after 2-3 minutes.

Just for the heck of it, if the side sensors aren't working, unplug them and see if the issue returns.