HAM4 chamber was open (door off) from roughly 10am - 2pm.  The actual job of swapping out a TCS lens, taking photos, and adding a Contamination Control wafer went smoothly and fast.  The only time-consuming issue was taking the transfer functions for SR2 & HAM4ISI (but Kiwamu, Betsy, & Jim eventually gave us a clean bill of health).  I will make a more thorough entry later.