Colour Laser Printer (needs TLC) (Bolstone HR2)

On offer is an HP LaserJet 2600n.
It’s a colour laser printer, duplex, with Ethernet connection.
It was my main workhorse printer for a while but at one point it started printing streaks of colour (see photo).
This might be caused by the fact that the last compatible cartidges I put in were poor quality?
I don’t print much anymore, and I had it in a corner for a few months, waiting for me to give it a proper look, but I never did.
If you want to try your hand at it, please come and get it. It might be that you end up with a printer that will outlast us all.