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The tube may be worn but I think a grayscale touch up would help it.
It definitely looks to Red to me, I agree that a little more Green might help, assuming the tube has more green to give.
I don't know if the Drive controls are Potentiometers on this set or in the Service menu.
The service menu on the XBR's of this era were accessed by pushing a hidden button on the back of the set while powering on.
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