Less than 3 hours after getting it damped.  Seems like too long a time to be an instability but who knows.  Attached is 30 minutes of the T240 before tripping.  Seems like an abrupt railing spike, not a building and continuing EQ surface wave.  Anyway there isn't a timely EQ for this one.  The SUS didn't trip and neither did HEPI; got to figure out the WD scheme.  Seems like this ISI has never survived more than a few hours....  I'll put it in lvl1 and see how it does this morning.

So ETMx ISI is in lvl1 isolation at ~0800pst.