Last night they had trouble locking, specifically ALS_COMM couldn't find IR (alog69063) , and found that if they avoid SDF_REVERT that they could lock. This afternoon when we were relocking we found the same issue. We went through CHECK_SDF and then after finding IR I looked through all of the different SDF diffs and trended ones that I though might be related to see if they were reverted last time we went through that state. The H1:ASC-{X|Y}_TR_{A|B}_WHITEN_GAIN and GAINSTEP seemed to be the issue and once I saved the values seen in my screen shots, we could go through SDF_REVERT and find IR without issue.