Have you seen the Colorfish Test pattern? Compare the one on the glass to the one through the DP:
Attachment 46911
The way it was explained to me the scanner uses tables of numeric values to convert specific colors to data for printing. The tables for the DP were in some way corrupted. This was a KM-3051ci.
This is the same test pattern printed on the glass & DP:
KM3051ci DP Color2.JPG
=^..^=
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