(Patrick, Filiberto, Richard, Gerardo)

Patrick found that the gauge at IP18 (X2-8) had flat lined about a month ago (12/10/2018), yes there was an alarm that was triggered, but somehow it went ignored, a reason why the alarms were ignored is that the populated field on the MEDM screen showed the last number, which appeared to be a "good pressure" thus showing a green number, but it was not updating.

So we ran a couple of test on a spare gauge, we found out that if the power to the gauge is decreased slow the gauge will shut off at 18.0 volts, for the gauge tested the last number remained on display, on this case at 1 atm.  Then if the power is restored slow or fast (voltage is ramped up or switched on at a selected voltage) the EtherCAT part of the gauge does not comeback, unless the voltage is above 22.0 volts.  Remember that these units (X2-8 and Y2-8) are powered by batteries charged by the solar panels.

We are still looking into the behavior of the gauges when they lose power, since Y2-8 goes to zero and X2-8 last number remains.

To add to the confusion I'm attaching a photo of the gauge as found, note the FIL light is on and steady green, when Y2-8 failed the FIL light was on but steady red.