Ofiicejet Pro K550 - poor colour - seems to be yellow at fault

My K550 has suddenly started giving poor quality colour. I've run the diagnostic page and the colour blocks from left to right are black, cyan, magenta, magenta, cyan. When I run the colour recalibration the top is black fading to gray, the next down solid magenta and the third a very very (almost non existent) pale yellow. I've changed the yellow cartridge but this makes no difference.
Can anyone suggest what is wrong.
Best regards
Doug

The only cartridge with yellow ink is the #57 cartridge.  It would appear you have a defective #57 cartridge.  If this is an original HP then check the warranty information as shown here.  Likley causes for this issue are ink cartridges that have stored for years or refilled/remanufactured cartridges.
BTW, the ink cartridges are as follows:
56  Pigmented black, not used when printing on photo paper.
57  Color cartridge with cyan, magenta and yellow dye based inks.
58  Photo cartridge with light cyan, light magenta and photo black dye based inks.
Bob Headrick,  HP Expert
I am not an employee of HP, I am a volunteer posting here on my own time.
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