We have done that it develops with the black drum. We also get it with the color drums but not as often. We went back today and replaced all the filters and vacuumed all the duct work thinking that it might be a heat problem but only time will tell at this point. We did notice that one of the ventilation ducts was clogged so hopefully this helps and the customer allowed us to put a fan behind the machine to blow more air through the filters.
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