I am getting consistent black ink smudges down the back edge of each paper. It looks like something from a drum that's abut 3/4 inch wide. I've cleaned everything I can access to clean. I wish I could submit a photo.
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Chances are high that the process of clearing the jam has resulted in ink being released from the cleaning/resting pad area based over on the right hand side (where the printhead sits when not in use). This waste ink has probable come into contact with the rollers and other parts over on the right edge of the paper. You'll probably see this ink slowly fade out and disappear over time. If it doesn't however there's something effectively feeding things so check the resting pad for a loose tube, overflow, puddles, etc... If there's anything like that, report back (preferably with images).
open the left side door and unscrew the two green screws that hold the fuser in the machine. look at the two rollers in the fuser. one is black and the other red i think. see if any toner is stuck to either of them, if so you will need to replace the fuser. check to see if the smudge is only with back or one of the colours. If it is on everything printed then the fuser is probably the cuplrit. If not then check each of the drums for tears on the blue surface. the drums are the same so can be swopped around. If back is smudged but colours are ok then the back drum is at fault.
If it is right along the edge then the drum (well the cleaning blade of the drum) is faulty. In a unit like that I suspect it is all part of a toner cartridge. Try replacing that and I think you will be good.
Very nice trouble shooting. The image defect you describe point to the OPC or drum unit this is essentially the toner cart. In your case black. Measureing the distance between repetitive defects is a sure way of diagnosing problems such as yours. Again nice work.
Google repetitive defect ruler for your model to help in the future.