J. Kissel

Another thing not monitored because it's (a) guardian controlled, and (b) will change amplitude and frequency over the course of several lock stretches -- which means it's righfully monitored by SDF -- is the roaming high frequency calibration line drien by PCAL X.

I noticed (from the DELTAL_EXTERNAL FOM on the wall) that the PCALX line looked pretty loud w.r.t. recent memory. Looking further at the screen on which these are defined -- I found (only because I remember what it used to be) that the frequency (1234 Hz) and amplitude (30000 ct) were before we made the changes to the guardian (see, e.g. LHO aLOG 49064). 

To fix, I just requested the HIGH_FREQ_LINES guardian to go to its INIT state, which restarted the sequence. The line is now at 4001.3 Hz as expected.