Attached script checks any jumps for ITM M0 TEST outputs (e.g. when operators run initial alignment) and L2 witness monitors (or oplev) starting 09/Jan/2017 UTC for 14 days. It calculates DC "response" in urad/urad, as in angle measured by witness (or oplev) per angle offset of M0.

In the attached, just look at middle two panels. Second panel from the top shows the DC "response" for both ITMX and ITMY, and you can clearly see that ITMY startted to act erratically after Jan 15 2017 10:30:00 UTC or so, and it was fixed as soon as the vertical offset was applied to push the optic up (third panel from the top).

Seems like V=-65.7um is the threshold for ITMY to rub something. Interestingly, when ITMY rubs, YAW is constrained but PIT moves more in DC. Also, since the vertical offset was applied, ITMY has slowly drifted back up by about 30um, probably due to temperature change.

Unfortunately this doesn't show anything about CPX because the M0 offset only acts on ITMX chain, not CPX.