There was a cabling error for the ETMX ESD DAC signals and this was the reason why we could not untrip the ESD driver. This is now fixed.

I drove down to EX and investigated the issue and found out that calbe #85 (see D1992741-v8) was conected to a wrong input of the AI chasis (S1102380). This must have been introduced today during the AA/AI chasis activity (see alog 18117). Since Stuart's medm screen (alog 17585) relies on the ability to see the analog signals, it was not able to tell whether the ESD driver was on or off even though the binary switches have been functional. I connected the cable back to the correct position which is the first slot (ch1-4) from the left on the front panel of the AI chasis. This fixed the issue -- now we can untrip and drive the ESD.