J. Kissel, after conferring with F. Clara, S. Dwyer, M. Pirello, D. Sigg, and J. Warner

Marc informs me that he and Fil have completed the standard checks for pins shorting between ground and chamber, and ground and any signal pins, aka "ground loop" checks on all SUS inside HAM6, and those tests have passed.
EDIT:  Some confusion betwen verbal communications. There are SUS that were not yet checked at the time of (previously) writing the aLOG.
There are some shorts that we're currently investigating delaying the closure of HAM6.

We've punted on checking any ISC sensors, namely
    - LSC OMC DCPDs
    - ASC OMC Input QPDs
    - ASC AS A & B WFS
    - ASC AS C QPD
    - SQZ Green & CLF rejected polarization PDs
because
    (a) Sheila & Co. did not touch (i.e. disconnect or reconnect, or move any cable routing)  any photodiode cables. 
    (b) If there were problems with these cables, we wouldn't be able to reach the feedthroughs and cable routing in order to fix them.
Sheila and Daniel sign off on this decision. The last time this chamber has been checked thoroughly was at the close-out of the Sep 2017-Jun 2018 vent; see LHO aLOG 41709, in which Keita found many ISC sensors shorted to the chamber, and fixed all of them.

We also punted (and always punt) on checking seismic sensors, because they "by design" intentionally grounded everything to the chamber inside, instead of at at the rack like ISC and SUS.

This makes "ground loop" checking in HAM6 complete.
Investigation on going.