Developer needs changing around 50k copies or if your solid colours are losing their evenness.
Anyway keep the Dev and get it replaced properly. All new Dev will almost always make your prints better.
If you get them replaced I would recommend doing it the hard way and opening the Dev units in the EPU and dumping the old dev, cleaning out the unit and adding the new dev rather than getting the machine to dump the dev and add it the new material itself. Good opportunity to clean the mag roller as well

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