Try cleaning the corona wire on the drum. It looks like a blue tab along the top of the drum. It may be necessary to reboot the printer also. You will likely lose those stored faxes but might be needed to reset the system.
You forgot to tell the machine you have installed a new drum unit.
After you get a new drum unit, remember to follow the instruction to reset the machine to let it know a new drum is installed. In my MFC-7840W, I opened the front cover, I pressed the Clear/Back button while turning on the machine. Answered the question by pressing 1 if a new drum unit is
installed. Then it works. Pete8888.
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