The attached figure shows the 26 days trend of the offset of camera servo. Apart from PIT2, the offset changes by a few count which seems reasonable. However, the offset of PIT2 changes by ~120 count in different lock. There seem to be two offset trends which are -155 and -274. The PIT2 controls the X arm SOFT using ETMX camera. I am not sure what this offset change means.

EDIT: Jenne pointed out that it could be because the SDF in safe.snap reverts the offset to bad value. I checked the SDF and found that the offset is set to -274 in safe.snap. I changed the offset to -155 and accepted it in SDF.