At the request of Adam Mullavey (via a phone call from Rick), I have turned off the 5001.3Hz PCal line at EndX for some injection work.  I did this by zeroing the amplitude of the line, leaving all other parameters unchanged.  See attached screenshot for setting before I changed them.

In a later email forwarded by Rick, Shivaraj mentions having to change Guardian code to keep these lines off at LLO.  I'm unaware of any such PCal Guardian code at LHO (my guess is that this is due to the fact that LHO doesn't use PCal for locking like LLO does), so made no changes to Guardian.  If someone reading this knows otherwise, please contact myself and the current operator.