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It sounds like the drum unit needs replacing. You can find a new one here: https://www.tonergiant.co.uk/product/Brother-DR2300-Drum-Unit-DR2300-85926/
Have you recently replaced the toner? If you've recently replaced the toner, did you detach the drum from the old toner and connect it to the new one? If not, that could be causing the issue.
If you haven't installed a new toner but you have recently replaced a drum, the memory may need to be reset by removing the toner / drum and switching off the printer and unplugging for 10 minutes. Then plug back in and switch on, then reinstall the drum and toner.