Verbal alarms reported a timing error just before 10pm (local time) Saturday night. This was a transient alarm, which cleared within seconds.

I have just completed the analysis of the error. The alarm was raised by the 1PPS comparator in the MSR, the fourth input signal went OOR (Out-0f-Range).

This channel is the independent Symmetricom GPS receiver, its nominal range is -200 to 0, at 21:58 4 Mar 2017 PST it briefly went to -201

Trending signal_3 for a day around this time shows that the signal wandered for several hours before settling down. I verified that the other three signals being compared did not make any excursions at this time, indicating the error was with the Symmetricom signal itself (trend attached).

Using MEDM time-machine, I captured the detailed comparator error screen at this time which verifies the error was "PPS 3 OOR" (image attached)