I have a c5030 in the field that started having faded magenta on their copies/prints. We replaced the magenta drum unit, but after about 2 weeks it started again. The tech found that the magenta drum was holding onto the toner and not laying it all on the ITB, so he swapped out the drum and developer from a C5235, it ran about 30 great copies then started again. He inspected the transfer rollers inside the ITB and they seemed fine but he went ahead and swapped the cyan and magenta to see if that changed anything but it did not. I've attached a PG10 plus some images of the drum (which we replaced twice in the beginning thinking we had a defective drum).
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