The drum unit was replaced because of immovable marks on one of the drums, not because it had exhausted its lifespan. I followed the instructions (Menu, 8, 4) to reset the drum counter, but I cannot get past 'Menu, 8'. (It only gives options 1-3). The drum life usage indicates a life of 64%. Does this mean I'll lose 36% of the life of the new drum? How can I reset the drum counter back to 100%?
--Brother MFC-9840CDW Laser Printer