If you have white streaks appearing on your copies on the Panasonic KX-MB781 four in one copier, printer, fax, scanner, there is an easy solution. 

Remove the drum assembly and check for toner in the narrow glass cover.  For some reason my drum leaked toner on this glass plate.  If you notice the bands of white getting wider, this may be the problem. 

Sorry, I have no clue how to fix blacks streaks which appear when the drum is getting old.  If you have a solution let me know.  Or if you figure out how to reset the drum counter, let me know.