Quoted from gmagno:
I am a couple of days away from purchasing a MB LE. The distributor told me they can't check production numbers and give me the highest but can confirm they have nothing under production number 100. Where is the cutoff on issue fixes related to production numbers or does it not matter? Thanks.
Others can chime in, but I'm not sure there were any critical issues on MB production other than playfield silk screening, which is still probably an issue. Mine has a build date in May of this year and the decals are wrapped, but differently than on my AFMr built in December 2017.
There was a software update, but it only addressed volume issues and the custom logo resetting with a power cycle.
The LEs were not the first on the line (they did a number of CEs and maybe some SEs as well before starting on LEs) so I would not worry about it too much.
PS The serial #s are allll over the place! They have little indication of the actual production date.