Magenta on all copies
Magenta ink on all copies as streaks
Could be a leak in the magenta cartridge. Remove the cartridge and look for excess toner in the spots where you see the streaks. You can also print an interrupted print, print a page and open the top when the paper is just starting to exit the printer. You can look on the paper and the image drums to get a better sense where the excess ink is coming from. If excess toner is on the cartridge, check for scraps of paper that may be stuck. There may be a cleaning routine on this printer to print a few sheets of paper to improve print quality, this should be found in the tools menu. It could also be that the magenta cartridge is near end of life and should be replaced.