A while ago we noticed that the auxillary loops have had increased noise compared to O1.  Here is a plot verry similar to what I posted in 30032, but with correct labels. 

Here is a more detailed timeline:

March 8th, the noise is pretty much the same as O1. 

March 12th: a 2W lock where the low frequency noise is similar to O1, but the shot noise is high. 

March 14th-20th, we were down for grouting work in which I think we lost the green camera references, alignment redone March 19th.

March 20th the exposure of the PR2 camera was increased from 500 to 1 million, then reset to 1000 March 21st.  Since the camera was saturated at 1000, I have now reset it to the old exposure of 500. 

I cannot seem to get data from late march until April 2nd, when the noise is already elevated.

April 4th the HPO is turned on, and we are down for several weeks, the noise stays around.  

So, this noise could be due to some clipping or other problem that was introduced when we lost our alingment references.