Today I checked the optical lay-out in MC REFL board of the MC REFL path on the AS table (I will put the updated diagram in a few hours), and took a record of the reflected power of unlocked MC and power entering MC REFL PD. The power coming out of MC cavity when unlocked is 1.25W and power entering REFL PD 112mW (Jenne measured these powers for me).
I also got a description of the MC demodulation board from Jenne.
(Edits by Jenne)
Also, when I walked through the control room later, the WFS were driving the MC crazy. I turned off / disabled the WFS from the WFS screen. In my infinite spare time, I need to put in the real-time triggering, so that the WFS turn off as soon as the cavity unlocks.