Brute force coherence report for the lock reported in 20020 is available here:
https://ldas-jobs.ligo.caltech.edu/~gabriele.vajente/bruco_1122206417/
At a first quick look:
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coherence with MICH and SRCL is still large at low frequency (fig 1 and 2)
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there is the usual coherence with AS power signals (fig 3)
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64 Hz is coherent with PEM-EY_MAG_EBAY_SEIRACK_X_DQ, PEM-EY_MIC_VEA_PLUSY_DQ and PEM-EY_MAG_EBAY_SEIRACK_Y_DQ
More analysis in the future...