Before sending it in to Nikon, it might worth contacting KatzEye and asking them if they've come across this before.
http://www.katzeyeoptics.com/page--Custom-Focusing-Screens--store.html
customerservice@katzeyeoptics.com
http://www.katzeyeoptics.com/page--Custom-Focusing-Screens--store.html
customerservice@katzeyeoptics.com
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