I recommend this method: http://umforum.ultimaker.com/index.php?/topic/5951-calibration-utility-leveling-ringsgcode/
It's a gcode for printing large concentric circles very slowly. You can easily adjust the calibration screws while printing. It gives much, much better results than using a sheet of paper.
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DidierKlein 729
Not sure about this but maybe there is something that makes the plate higher on the upper right and a bit lower on the upper left.
Maybe check the screws (not sure what screws).
And take a look at the manual you can download here to help:
https://github.com/Ultimaker/Ultimaker2/blob/master/um2%20assembly%20manual%20V1.1%20_english.pdf
And also make sure you're on the latest firmware there was a bug in leveling with previous firmware (14.07 solves it)
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