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If replacing the Toner cartridge fixed the problem then obviously the cartridge was defective. The cartridges should last "up to" 16,000 pages ( 5% coverage ,11" paper) Take the cartridge back to the Dealer you bought it from and explain what happened.
Ok , I want to clarify. You have a line on all printing? When you receive a fax, when you print and when you copy?
If so, you need to replace the cartridge with the drum.
If It only is when you fax out and make a copy, then open the scanner and clean the strip over the CCD assembly in the scanner.
What happens is that something, Whiteout, ink from a page windes up getting on the scanner glass and as the original passes over it, it scans as a line and shows up on the paper as a line.
It is the fuser at rear giving you grief! The upper heat roller has a teflon coating that wears away allowing toner to stick to roller and smudgin prints as they pass threw it. The fix is to replace fuser assembly, take to brother dealer to fix.
You can prove it to yourself by timing the print to stop mid way threw machine then remove print cartridge and look at paper, you should see a image is good untill it hits the fuser,( pre fused image "rubs off" paper.) If you have changed drum and toner thats all it can be. They all do it in time.
Fuser is hot bit at rear, pull out drum and look in the back with a small torch you will see upper heat roller is worn, guestimation $90 for fuser plus labour to fit.