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You are 100% correct. However, improperly installed charge rollers will cause a nearly identical print quality issue. The difference is that when the charge roller is the cause, it will cause...

Lift motor(s)

Install washers around the screws between the finisher's electronic connector and the frame behind it to reduce the wiggle and improve the connection. This has worked on dozens of these machines.
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LSU needs good internal cleaning. If no improvement, may need to replace each of the LSU which are having this issue.

In my experience these are caused by transfer belt units, and less often caused by drum drive unit. I've seen this 7 times on the series prior. 6 times transfer belt fixed it, once it was the drum...

You've been a technician for 31 years without proper compensation for your work? I feel bad for you.

Do you get bonuses for your performance in any way?

https://my.beiservices.com/howitworks.php

I assumed most copier techs are graded with this system.

Most times I have seen that specific pattern it was the main charge roller. Interesting hearing about the worn developer issue, I'll need to start checking for that.

That sensor loves to break. I use the grip end of my telescopic magnet to check if it is loose or not before ripping the exit unit out. Glad you were able to find it

Awesome! Where is this motor located? Is it the motor that drives the laser scanner cleaners? I haven't had the pleasure of tearing a 2 or 3 series down to the LSU yet, but the older models would get...

Trump supporters have the worst BEI numbers. That's not me talking, it's science.