I started this thing, and I want to end it. This thing is easy to fix. Brother at 800-276-7746-1-5 said they serviced laser printers, not MFC laser printers, so they connected me to the MFC group at 800-284-4329 and they knew everything I needed to know, which is very little and also about equal to what I already knew.. I had apparently spilled a little toner on a glass strip under the drum unit. Th fix, pull the drum, wipe the 6" x 1/2" glass strip under where the drum was, and wo la, the vertical white lines are history, and I didn't even unsheath my #2 phillips. Thank God for tech support.
PS Cleaning the Corona wire is also recommended. There is a blue deal on the underside of the drum unit. Slide it back and forth about 7 times. Thanks