I have the same issue with my 252, however I would title my issue differently. I replaced the Corotron as the 252 requested and the replace corotron message remains showing after replacement. However the machine runs with the replaced part where as before replacement it stopped.
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It is always best to post a message for each issue so you can identify solutions which would help the other forum users. Additionally the other community members may monitor specific products and a multi-product topic can get lost which delays your potential response.
Regarding the DC252 corotron CRU:
If you replaced the Corotron and it did not reset automatically, then you would need to replace the drum module CRU.
I've repleaced the Xerox 01R00630 Charge Corotron Cartridge on the Docucolor 252. Now I'm having a problem resetting the counter back to 0.
I also have a the Xerox D110. When you make copies, the top part is cut off, and the copies are faded.
your help is greatly appreciated.