I am looking at buying a used WOZ that was manufactured 2/2014. I have been reading posts about all the problems that these early ones have had and was wondering what I should expect.

Since this pin was purchased it has had:

Burned power supply replaced - at no cost - JJP
Multiple issues with LED board connectors breaking. Getting replacement cable from JJP takes months.
Upper playfield doors jamming - rebuilt and adjusted. Seems to be working now.

I suspect that these LED boards are not buffered, but do not know. Will this be an issue? Can I modify them? I do not know their voltage but could ask JJP.

It looks like the LED boards have the small 0.100" (?) connectors. Is if feasible or needed to change those?

Anything else I should look for or be scared about?

This is not a HUO pin. It has received heavy use on location for about a year, then was used by a distributor, supposedly summers only, for three years before that.