I checked the alignments of the IMs since I finished working yesterday, and found that IM1, IM2, and IM4 recoverd their alignments when restored this morning, but IM3 did not, it has a significant change in alignment in pitch and yaw.
IM3 change in pitch is ~-1000urad, and change in yaw is ~-1500urad, however the alignment sliders are at (0,0), and have been since yesterday, so there's no apparent reason for the change.
My investigation into IM3 found the source of the change in alignment. Set screws on the upper OSEMs and bolts on one blade assembly were not tightened to the same spec that I'm using during this vent (to correct the torque of all of the bolts in the IM towers).
These are easily identified as bolts that were loosened for the recent bias relief and wire shift on IM3, so mystery solved.
Before correcting the bolt torque, I tapped the IM3 tower and the IM3 OSEMs/blade spring shifted, changing the optic alignment.
Bolt/set screw torques were corrected, however the OSEMs still need to be recentered, which will happen tomorrow.
UPDATE - SEE ALOG 39702:
These shifts were actually due to the 4 bolts that hold the top plate of the IM cage to the rest of the IM cage, which are hidden under the blade spring EQ stop brackets, so have not yet been torqued to spec. While a few incidental set screws and bolts were not quite torqued to spec in other areas on the IM cage, as I noted in my comment, those were not actually the cause of the shifts. The root cause of the shifts are the 4 hidden loose bolts that are allowing the entire top plate of the IM cages to move, altering the IM alignment.