I checked which channels are affected by DARM DoF in ER3 data.

Method: searching for calibration lines (ref. 12177) in spectra of auxiliary channles 

I attach the table of channel list for each line.

Comments

* MICH is affected at ~31 Hz, not at ~89 Hz.

* DHARD pitch is affected at ~31 Hz, not at ~89 Hz.

* ETMX damping signals are affected by PCal lines.

* PEM magnetometers are affected by PCal lines.

* PEM accelerometer on EXA RX table is affected by PCal 31.3 Hz line.