Francisco, went to End X to do a beam movement, and I asked him kindly to just block a few beams for me, as a test of  the threshholds for PCALX_STAT Guardian.
Francisco blocked the beam for more than 60 seconds which should have reduced the TXPD values to their minimum values.

Conditions to be met:
CAL-PCALX_TX_PD_WATTS_OUTMON > 0.002

This minute of time where TXPD is below the minimum threshhold should have taken PCALX_STAT into A fault mode. 
But it never did.
This is because I changed the PCALX_STAT ISC_LOCK state prerequisite from 600 to 10 for this test today. But ISC_LOCK was in PREP_FOR_LOCKING[9] Instead of IDLE[10] which is what I expected to remain in for the duration of maintenance. In hind sight I should have just taken the ISC_Lock depenence out of the Guardian node completely.

Thanks goes out to Francisco for giving me a hand on a busy day.