Hugh and I mostly finished cabling ETMY ISI today, but were held up by an issue with the CPS's and some broken test feed thru components. After we powered up the CPS's, we were systematically disconnecting sensors to verify routing and we noticed that the corners 2 and 3 were acting weird. After rounds of calling Richard, plugging and unplugging various cables, we figured out that the ribbon cable that carries the sync signal from the satellite rack chassis to it's power/distribution board was plugged in backwards. The other racks have keyed cables to prevent this, but this rack had an unkeyed cable. After fixing this we found that we also have a dead sensor, further debugging has that narrowed down to a broken probe. We don't have time today to finish balancing, so we'll continue on Tuesday.