I see a 11.35Hz peak when I took a spectra of the damping loops for the main chain of ETMX this morning. Please see the attached plot. I went back in time on dtt and noticed that this peak started since last Tuesday (28 June 2022) when Dave et al power cycled h1susex, and replaced DAC (see alog 63748).

The reaction chain looks good - as seen in the plot over here.