My CR-6 SE arrived today... it worked for 1 print and then the autolevel stopped working... it just keeps trying to drive through the bed...

I've replaced the EE-SX671 with the spare,
Updated the firmware,
checked all the cables....

still no joy... I've noticed that the sensor board flashes when you turn it on a few times but never lights up when you apply any pressure to the nozzle...

Now what can I try?