Colorcource PAR calibration

Hello! 

I have a bunch of CS Pars that is purchased in the end of 2016 and they start to drift in the color calibration. 

Is it a way to recalibrate them?

I attach some fotos.they are all in direct mode, latest firmware and controled from a Gio with eos 3.2.0 and given color from by type pallets made from eos color picker, standard colors.

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