After Rick restarted the PSL this morning, I saw that the PMC trans read back on the mddm screen is 3Watts, when it should be more like 10Watts.  It doesn't seem like the power has actually dropped, since the ref cab trans, ISS PDs and the periscope bottom mirror trans PD are all approximately the same as they have been.  The attached screenshot shows that the signal from this PD dropped on Dec 22nd, although the power on the ISS PD did not drop.  Kiwamu previously investigated a similar issue (alog 8622 ) and the readout came back to normal after he disconnected and reconnected the lemo connector to the PD.  

It seems like we have either a bad cable or a bad connector on the table that needs to be replaced. 

I also added a link to the PMC trans power filter bank on the PMC medm screen.