So since the Noise in EX didn't go away (see
LHO alog 53242). Apparently they powered down the NCAL motor, but not the data encoder that goes into the ADC. The ADC is where we see our noise. Vlad and Fil went down to EX and had this encoder fully powered down and disconnected, at about 0935 local time (so 1735 UTC).
This will also mean that the is currently no data avaiable from this time in the frames for H1:CAL-NCALX_ENCODER_VELOCITY_OUT_DQ
Encoder power was switched off at the BRS rack. The encoder cable going into the AA chassis was disconnected in the electronics bay.