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For some raison most of arnold shaders has a duplicated attributes stored in ExtraAttributes, I corrected some of them.Hope the team can take a look here
Here is the missing Sheen Attribute in mtoa.mtd file (C:\solidangle\mtoadeploy\2018\plug-ins)
Here are the zipped file if someone is interested
ae.zip
Override the ae folder: C:\solidangle\mtoadeploy\2018\scripts\mtoa\ui\ae
This will be fixed in the next release.