Well, from the pictures on the thread it looks simple enough to trace out. One board looks like the usual Schoeps influenced circuit found in most China mics.
Sound will most likely be capsule-limited. Most of the caps looks like film or tantalum - I don't think you'll notice a big difference if you swap them, but who knows!>
The other board with the two inductors and one transistor must be the DC converter for the capsule polarisation. Don't muck about with that unless you are hard-core.