J14 OEM Debug Connector

Inside the device is a OEM connector labeld J14 that probably served as development and debug access for components of the device.

How to access J14

Open your device according to this IFIXIT Guide:
The pads are coated with a solder mask. The solder mask can be removed carefully with a sharp object.
Be careful you don't want to cut any traces. This could damage and destroy your device! Pad size is 0.5mm
J14 Connector on Mainboard of SurfacRT - taken from and upscaled

J14 Schematic

If you can identify some pins feel free to update this Schematic template