Issue could be the the itb since the direction of the lines is in an up and down pattern the way the paper comes out since you are feeding landscape. In looking at the bars on the left and right side of the config page I really do not see that much difference in the colors from top to bottom. You need to first replace the magenta toner cartridge and see if the print quality for what you do is acceptable. If it is, then nothing else needs to be done. If the quality is not acceptable you may need to replace the itb (transfer kit).
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