Given our new coherence between DARM and OMC_REFL we looked at the power level on OMC_REFL and AS_C in locks today and before the break.

First attached plot is IM4_TRANS, AS_C, OMC_REFL and the squeezer beam diverter during a time in O4A (~Jan 18). Second plot is the same PDs since the break

IM4_TRANS has 5% less power

AS_C has 4% less power

OMC_REFL has ~16% more power

Edit: I zoomed out and it looks like OMC_REFL was at normal levels in the locks on March 8/9, and higher in the locks on March 11/12 - updated the attached photos to include broader times.

It looks like in the later locks the offsets on the OMC_B QPD were turned off (third plot, sorry my x axis got a bit messed up), so I guess this excess REFL power is just bad alignment.