Bruco evidences that in the region 150-160Hz  DARM has significant coherence with LSC_PRCL  (Figure 1) and LSC_MICH (Figure 2) yet not with SSFS. 

As shown in Figure 3, this noise appears as a clear bump in MICH and PRCL, while in DARM seems visible just part of it on the right side of the 156Hz peak (which we know is one SDB1 structure) and maybe contributing a bit underneath the 150hz line.

We suspect that this bump in MICH and PRCL is sustained by scattered light from the B4 ghost flange (the point is similar to what found for the 45Hz and the 90Hz bumps which were "sustained" by seismic vibrations at 45Hz and 92Hz produced by fans).

In fact, looking at accelerometers (superimposed in the bottom plot in Figure 3) it can be seen that the 160Hz bump corresponds to a similar seismic structure which is most evident in the ENV_B4_GHOST_ACC and ENV_PR_LINK_ACC accelerometers, less evident in the ENV_SPRB_ACC and essentially absent in the ENV_PR_ACC (which is at the South flange of PR).

Then, looking closer, the B4_GHOST accelerometer seems to "explain" better than the others also all the other little bumps of MICH and PRCL, that  is: the little bumps at 130Hz and 143Hz.

To conclude, Figure 4 shows the same comparison as in Figure 3 but done before the removal of 45Hz and 90Hz bumps.