Found the FSS common gain set to 17.7; its usual setpoint is 20.  Trending back, it looks like the gain changed at ~10:20 UTC (~2:20 PST) on December 1st, which coincides with Ed's RefCav locking issues from Sunday morning.  I spoke with Ed (both this morning and during Sunday's RefCav locking problem) and he did not adjust the common gain during this time, only the fast; Guardian was controlling the common gain (recall that we use a Guardian node to automatically reduce and restore to the FSS common gain to cure loop oscillation issues).  At this point the only guess I have as to why the common gain didn't come back to its usual value of 20 was some issue with the Guardian node (will talk to TJ).  I restored the FSS common gain to 20 at ~19:58 UTC (11:58 PST).  This channel is unmonitored in SDF (as Guardian changes it as previously mentioned to cure loop oscillations), so there was no SDF change to accept.

Edit: Added attachment showing common gain change on Sunday morning.