TL;DR we turned off the dang agilent and instantly got past DARM_TO_RF

Long story is, we saw a ton of glitches in basically every PD at different levels of severity.  One which saw bad glitches was AS_A RF45, which is what we use for control in DARM_TO_RF.
A rouge commissioner who wanted to measure the IMC loop in full lock had left the Agilent plugged into the IMC servo board excitation port, causing some ground loop glitching throughout the racks, which translated to actual laser frequency glitching and optic motion which could not be handled in the DARM loop.
The commissioner regrets the error.