Since X-4 is not flattened, there is no possibility that the lines are in the PDF and this is caused either by reprocessing the PDF in some way (are they placing it in another file?) or a printer driver problem.
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Since X-4 is not flattened, there is no possibility that the lines are in the PDF and this is caused either by reprocessing the PDF in some way (are they placing it in another file?) or a printer driver problem.