H1 just dropped out of lock.  Praxair is NOT on site, so not sure of lockloss reason.  Sooooo....Took us to PREVENTATIVE MAINTENANCE, for these activities:

• 17:47utc:  Kissel performing Charge Measurement (~1hr)
• 17:53-17:57utc:  Gray Reset PSL Watchdog at 17:55 (~5min).  [NOTE:  I swiped in/out (but Access system has a "Door Forced" alarm).]

Humorously, as we dropped out, William P. called up to see how we were doing since they (L1) had just made it to Observing.  :)