The best test to find the defective component is a "half-test." You interrupt the print job by opening a cover. See if the drum/ toner has produced the defect already, or if the defect is created at the end of the print process.
The most likely suspect would be the fuser producing ghost images every 3 inches in a repeating defect that fades out.
Make sure that you are not using thick or glossy paper on the wrong setting. The toner won't bond if the settings are too cold.
The Brother part number for the fuser is LM6313001K for the white connector. If you have the grey connector it will cost slightly more. They are not compatible, so be sure to match the connector when ordering.
Whit
Item, Inc,
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