Ok. So after searching around, I found the following video by Cameron Meers, that shows the disassembly of an A50.
https://www.youtube.com/watch?v=36zi2EIH254
The issue with removing the back of the case is, you don’t, you go in through the inside. I just didn’t know to remove the inner foam pad. Once I did that I was able to complete the disassembly, and find the broken wire that seems to be that problem.
My general observation is that this is a very cheaply built product. The wire that failed is subjected to movement and flexing every time the mic is repositioned. With such flimsy components, and no thought apparently given to the fatigue factor on the wire, it comes as no surprise that the wire fatigue-fractured where it enters the PCB solder location. In the video (time stamp 1:19) you can see the wire in question, between the yellow and the bare copper. In my headset, that wire has broken away from the solder connection. I hope this is the only issue, but resoldering that wire is an obvious next step.