Been fighting this issue on several machines. The dv seams to be leaking everywhere inside the machine. I am using mx-753nv dv and setting the dv with sim 25-2. Have had mixed results with installing new dv units and processing units. Was told by distributor rep that it was a ground issue with drum. Which led to a new brass bussing on the drum guide rod and the new processing unit but this issue keeps coming back and is showing up on more machines. Any help would be appreciated.