I broke lock turning the ETMX ESD low pass filters on.  I put them on as I had a feeling that this help PI damping yesterday and the ETMX 15541Hz mode was out of control and would broken lock.
We have now put this change into the LOWNOISE_ESD_ETMY gaurdian state along with the request for the ETMX_PI_DAMPING state from the SUS_PI gaurdian.