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Spotted/mottled background print result

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Hello,

This is my first post. I do prepress production for the publisher of the Carmel Gallery Guide. The publisher had a problem on a press check with a gray background that printed very mottled. The printer said it had nothing to do with the prepress or image, but was a press issue.

Can someone tell me what might cause this?

The form was 40" x 28" run on a Heidelberg duplex sheetfed press.
The area where this problem occurs is on the gripper side, in the corner.
Total ink coverage is less than 300% total ink density. Dark areas show more of the spotting.
Gray area ink values are approx. 77% cyan, 67% magenta, 57% yellow, & 60% black.
Our ad page size is 4" x 9".

When I inspect the form it is slightly out of register in the affected corner (1/2 point), but this doesn't look like a registration issue.

Attachment is an attempt to show the spotting, but image quality is poor.

By the way, we love our printer, but would have liked to get a better result for this particular image.

Thanks in advance,
Pete
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