Even in the switched state, the glitches stayed on MC1.

The coil driver electronics for MC1, upstream of the Satellite box, was what was previously MC3 electronics.

Attachment #1 shows that there were no glitches in MC3 sensor channels (which are now physically connected to what was previously MC1 coil driver electronics).

Attachment #2 shows the second trends for a 12 hour period for MC1 and MC3 sensor channels. The MC3 channels look well behaved, but there are frequent glitches (at least 9 in the last 12 hours ) visible in the MC1 channels.

So to recap:

• We switched MC1 satellite box - but glitch stayed on MC1, so it would seem the Satellite box is not to blame.
• We shutdown the watchdog and the glitches persisted.
• We switched the coil driver electronics for MC1, but glitches remained on MC1, and MC3 doesn't show any evidence of glitching. This and the previous bullet point suggest the coil driver electronics are not to blame.
• For the glitch posted in Attachment #1, I could see the MC-REFL spot moving around on the CCD monitors, so the glitches aren't just a feature in the shadow sensor readout. 

I need to confirm that the output of the coil driver board goes straight to the Sat. Box, but if there are no intermediate elements, the problem is either in the cable from coil driver to sat. box, or downstream of the Satellite box - i.e. vacuum feedthroughs or the suspension itself? The size of the glitches is roughly the same in all 4 face channels (~60-80cts pp).

GV addendum 14 Aug 2017, 10.30am: Attachment #3 shows the second trend for the MC sensor channels over the weekend. While there were many on Saturday, it seems that Sunday was quieter.