One key diagnostic you need to perform is a nozzle check. This will
tell you what has happened to the other ink colours as much as indicate
if yellow is polluting other nozzles.
You can run a nozzle check from Printing Preferences > Maintenance.
Once it has printed you should (normally) see a sort of stepped grid pattern similar to
this.
If
you can scan or take a photo of the output and the post it as a follow
up it'll then be possible to get a bit more of an idea of what could be
happening.
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