Jim requested that I unlock the ETMy SUS during a break in his measurements of the ISI it is on. So, I used the last hour to do so, removing 15 brackets and unlocking the 78 associated screws to free all of the masses/blade springs. After confirming the top stage BOSEMs were still pointing the correct direction, Jim was able to enable the damping. Carry on, Jim.
Note, while I was there, I spotted a pile of particulate on a 1" horizontal surface of the ETMy lower structure just below the test mass HR surface. It looks mostly to be glass with some metal - I think broken fiber glass is still raining out of the structure from the fiber break in Dec.