Adjusting contrast settings on CEM+

So in a system I am building for a rental client, I have one CEM+ where the display contrast is much lower than normal.  At first when I power it up, it is fine through the "ETC CEM+" screen and for a few seconds on the "ETC CEM+ 3.1.0" screen, before it goes dim.  Once it goes dim, it is hard to read past 30 degrees off axis with the backlight on, and hard to read at all with the backlight off.  As I mentioned, this is running v 3.1.0.  Thanks!

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