0300 0c00 0001 0003 - Force sensor error

My X1 carbon has problems when calibrating the z-axis with its force sensors. The error-message “0300 0c00 0001 0003” appears (see picture) on every third try. Where is this force sensor 3 and how (where) could I check the connection (which connector on the controlboard is for sensor 3)?

Edit: found everything that I need in the Bambu Lab Wiki!
bambulab-bug

Anyone know anything about this?