Brother MFC4800 Printing Problem

Hi,

Looking for 2nd opinion or additional troubleshooting tips IRT Brother MFC4800 Multi-function laser printer.

Current problem is that numerous vertical lines cover the width of a paper upon completion of print job. Steps taken to resolve thus far have been to clean the scanner window, toner sensor, corona wire, & drum unit. Drum unit type is remanufactured Brother DR-250.

Any additional assistance is appreciated! Thanks!