Toner Smudge Down Page - HP Color LaserJet Pro M454dn

[CH7244]

Approximately a week ago, my HP Color Laser Jet pro M454dn printer, began printing a smudge down the left hand side of every page. I've run all the HP Smart diagnostic tools available to me: Diagnostic Report, Calibrate Color, Clean the Fuser, Check for Firmware Updates, etc. The most recent Calibrate Color & Clean printouts look exactly like the first ones. I am  using this printer for business correspondence and it hardly looks professional. Please kindly advise me on anything else I can try. Otherwise, I'll  need to call a local repair service provider. Thank you!

 , opened the printer to look for areas to clean, 

[Valsimot]

You have a damaged fuser, no cleaning will help, fuser needs to be replaced. It's not a cheap fix, fuser is pretty expensive part.