White horizontal lines only in Magenta solid print area.

When printing a solid magenta there are white horizontal lines. 
I have cleaned the print head to level three with no positive results.
What can be done?
The other three colors print perfectly.

Please read this post then provide some details.  What printer model?  Are there any error messages on the printer or computer screen?  Are the lines spaced regurlarily or randomly?
A pattern of regular repeating lines would generally be the result of an electrical issue between the printer and printhead.  Cleaning the contacts in both the cartridge and printer as shown in the document here may help resolve the issue.
Bob Headrick,  HP Expert
I am not an employee of HP, I am a volunteer posting here on my own time.
If your problem is solved please click the "Accept as Solution" button ------------V
If my answer was helpful please click the "Thumbs Up" to say "Thank You"--V

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