OT: Laser printer hardware maintenance question - ghosting

[Kenneth Brody]

We have a color laser printer (Dell 2150cdn) that has started "ghosting". 
Specifically, when printing a large solid area of color, only the outer 
border of the region prints, and the toner that should have been the rest of 
the "inside" prints a few inches below where it should be.  (Lines and text 
print fine.)

I have run some Dell-recommended maintenance on it, including using a laser 
printer cleaner sheet, and it has gotten better.  However, the yellow toner 
still exhibits the same behavior.  (When printing a ghosting test page, the 
black, cyan, and magenta are perfect.)

We've had the printer 2 years (in fact, the printer says it was initialized 
26-May-2011, so it's almost exactly 2 years to the day) and the status 
report says we've printer 4763 color pages and 5523 black pages.

Does anyone have experience with laser printers ghosting, and do you have 
any suggestions on where to proceed from here?

Thank you.

-- 
Kenneth Brody