I had the same problem. Since I knew my PCU was still good, I figured it was just the connections. I repeatedly fiddled with it - PCU in & out, wiped clean, held in place as I closed the latch plate. I finally got a long, skinny cleaning brush (a wierd feather-duster thing my wife uses for cleaning tops of books on the bookcases) and cleaned the slot out; that seemed to help. Note that I took great care because I was not sure what I was touching, and I did not want to leave any 'feathers' snagged inside.
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Fuser hot belt has wear lines transfering to the page
Black pcu needs to be replaced
Transfer unit is not being cleaned properly and needs to be replaced.
Remove each of these assy and inspect them for wear or lines that corespond to the lines on your prints.
Black drum motor error. These machines are bad about the waste toner building up in the drum unit. You could try and take the auger out of the drum unit(very messy) and clean it out or try replacing the black pcu.
You get this message because the PCU isn't seated properly.
This is a link for the user manual for this printer:
On page 13 shows a diagram that indicates the photoconductor unit on the printer.
Page 60 shows you different error messages, what they mean and how to fix it. It means you have to take out the pcu and reseat it into the printer, it is not in correctly.
Page 29 shows you how to do this. It has pictures of how to take out the pcu and put it in correctly.
I hope you get it fixed.