Attribute Holder Button

I want to access the reset option inside a custom attribute.

I look at the code like this

def=custAttributes.getDef $.modifiers[1] 2

custAttributes.getDefSource def

$Character_root_Ctrl.modifiers[1].pmAtt.pmAtts.loadSaveRoll._rst.pressed() --------->Wrong Path!!!

I need to find the exact path to activate the reset option contained in the Reset button. Can anyone help me? Thank you very much.

Animated Gif

3dsmax scene:

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