OK. It appears that you have leaking toner cartridges.
This is especially likely, if you have been using cheap, or remanufactured, or refilled, toner cartridges in this printer.
I advise replacing one of the two colors affecting printouts... the Magenta toner cartridge, or the Yellow toner cartridge. See if that fixes the streaks of the corresponding color, if it does, replace the other one also.
(And if the one color replacement does not fix the problem for at least that color, you have saved on the cost of the second replacement by not replacing both at once.)
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