Back in February 2016 G56 posted this picture on Facebook with a comment "This is the disappointingly healthy looking insides of a noisy bevel box. 10 points, redeemable nowhere, to the person who guesses the cause of the problem correctly!".

I recently came across the post, and upon zooming in, was surprised to see the clear indication of a poorly adjusted gear set. The wear marks on the ring gear are right at the heel - to the extreme. A classic "HEEL CONTACT PATTERN" is concentrated off the heel end of the drive gear tooth. The solution is to move the ring gear closer to the pinion (decrease backlash) while maintaining minimum backlash.
Here is the zoomed-in image:

I'm curious if any other BBs have been disassembled to look at the developed wear pattern.
And no, G56 didn't respond to the post with any updated information...