Hello wfish,
Here is an article that will give you some steps to try and resolve the horizontal lines. If you are still having issues after trying these steps, I suggest that you call into our support department for assistance @ 1-800-821-2797 or 1-800-835-6100
I have a Xerox WorkCentre 3215.
Printouts have horizonal lines that fade in the middle but seem to be fairly consistant from one printout to another. I have replaced the toner cartridge and cleaned the drum and anything else i can get to but no change.