Jog the bed up carefully using the Z-.50 and Z-.05 buttons until the nozzle grips the paper

Once the nozzle grips the paper send G92 Z0

Lower the bed 10mm

Move the probe to bed center(same amount as step 3 but move it to the right)

Send G30 S-1. This will probe the bed and tell you the offset. Move the bed to Z10 and run G30 S-1 again. Repeat this step a couple of times. When finished move the bed to Z10.

Take the average of the Z offset readings from the console and replace your current G31 P500 X-42.45 Y0 Z## in config.g

Save and restart your printer