HP LaserJet 4000: toner down left hand side

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I have a LaserJet 4000. Printed about 68000 pages. Always used genuine HP cartridges. Cleaned the printer each time a new cartridge was installed, per HP's instructions.

Recently, printed pages have emerged with light smears of toner about 10mm (half an inch) wide down the left hand side. Within the smears I can see ghost images of previous pages that have already been printed.

This does not look like a cartridge problem, more a drum problem perhaps?

Ideas anyone?

--
Ian
 
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