"Drum Warning" error indicates that the drum is running out. I think you can still print or make copies, but it will not last long and will run out very soon, at that time, you have to replace the Drum.
Hope this helps.
Good Luck.
Thanks for using FixYa.
SOURCE: Drum Unit Warning will not stop after replacement
Hi there
You need to get into the menu and in there reset the toner,
All best Pineworks
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