In alog45288 we measured 44% transmission from ISCT6 fiber coupler into chamber. Attached a plot showing transmission dropped over two days from Nov 30 to Dec 2. SHG launch shows somewhat constant power going into the fiber coupler while OPO REFL dropped 40% to 23%. Also attached another plot over 20 days. Terry also recovered ISCT alignment so we now have 83% transmission to the end of 5m fiber (alog45871). We've never recovered 40% level of transmission.