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MFP M277dw printing vertical yellow streaks

HP Laser Jet Pro MFP M277dw
macOS 10.14 Mojave

The printer is printing vertical yellow streaks when printing, and horizontal yellow and white streaks when copying (see attached photos).IMG_2655.jpgPRINTOUTIMG_2654.jpgCOPYIMG_2653.jpgCOPY

Here's what I've tried to do so far:

1. Printed a cleaning page

2. Unplugged the printer for several minutes, plugged it back in and  tried it again with the same results


Other things to know:

• I'm connected to the printer via our wi-fi network, which works perfectly. 

• I discovered the problem when I tried to print and copy a couple of things for the first time.  Both had heavy concentrations of yellow and green.

• I'm running on Mac Mojave 10.14.2, the latest version of the operating system. 

• I have not made any recent software or driver changes. 


Please help me fix this! Thank you! 

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