I understand that the yellow toner cartridge is bleeding onto each print made by your Color imageCLASS MF726Cdw. For clarification, I have a couple of follow up questions:
1) What type of paper are you using (e.g. plain paper (16 to 23 lb Bond), heavy paper (22 to 31 lb Bond), etc.)?
2) Have you tried a new yellow toner Cartridge 118?
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