Just had one of our brother 5250DN complain it needs its drum replacing and refusing to print. stock cupboard is bare!
Just a handy tip I found thought I'd post it
If you do the following it resets the drum counter and the printer works fine:)
1. Open the door
2. Remove the drum unit
3. Press the Go button until all the lights come on in amber colour
4. Let go of the go button
5. replace drum unit
6. Close the door
Happy days