I looked at the frequency stabilisation servo this morning.  As it was the UGF was a bit low
at ~185 kHz with a phase margin of ~35 deg (CG=16, FG=9).  Raising CG to 22 increased the phase
margin to ~48 deg but didn't quite put us where we would like to be.  Dropping CG to 19 put the
operating point to where we would like it to be.

   I took the opportunity to touch up the alignment into the reference cavity.  The transmission
signal went from ~2.7 to ~3.5.  I restored CG to 16.