V-Minion X Axis leveling

My X axis shifted downwards a bit on V-Minion, and now I dont know how to level it. When I do by the ruler, one side of the print bed is higher than other. Manual says to let i balance itself, but I have print head on and thats pushing it down.
How to level X Axis on V-Minion against Z Axis with print head on?
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