The noise that is described in this alog: 71725

This type of noise can be seen on summary pages for PCAL on many days, on both arms, at different times. 
Looking at the Layout of the Transmitter module.
Because the noise can be seen on both the TxPD and OFSPD, this means that the source of the noise is up stream of the OFS and TxPD. Either the AOM or the LASER itself.

I took some Coherence and Power spectrum plots of the OFSPD and AOM DRIVE while the system was performing well at 08:00 UTC today.
And
I then took some Coherence and Power spectrum plots of the OFSPD and AOM DRIVE while the system was NOT performing well at 05:30 UTC today.
And
These were my settings.