While range of motion test was being run (Range_Motion_Adjustable_HAM_HEPI.m) on HAM6, a large step was seen. 22000 counts were going out the OutFilters. See attached for the local sensor trends. I've applied the calibration of 655counts/0.001" to display mils. The step occurred near the beginning of the test while pushing with individual Actuators. Note that the signs of the horizontal steps are all positive! This means: * The Crossbeam to Support Tubes clamps have slipped out, or * the Crossbeam has been bent outward, but, the West side Vertical shifted down early in the test and the East side also finished lower, so maybe: * the Crossbeam rolled and it has a bend Dial indicators at the Support Tube Ends saw much greater shift down than the vertical IPS -- 19 to 25 mils! Now I'm not the first one to run this test on a HEPI but this shift is enough to put a very careful alignment out of whack. Yeah so I don't know, any thoughts?