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My MFC-7420 began to display the message "Drum end soon" so I quickly went out and purchased a new drum. But I decided not to install it until I needed to. Because what does "drum end soon" mean? I thought it would mean that the print quality would deteriorate enough that I would notice the problem. So I continued to replace toner as needed, and pushed the blue cleaning thing down the wire regularly. This went on for over 3 years until *finally* I started having regular print job production problems. I replaced the drum, and the problems were solved. So,my advice is be prepared, but don't replace the drum until you have to -- the message means very little.
To clear "replace drum", open the front door with the power on and press the "clear/back" button. The display should change to "replace drum?", press the"1" button then "ok" button and close the cover. That should take care of it.