Comparing POPAIR B now to the last good lock in July (before the damage), we only have 54% as much power in POP18 in full lock, in DRMI we have 71%.  At full power, the power on POPAIR B is 78% of what it was before the damage, in DRMI we have 86%.  This might indicate we have an alignment problem, which could perhaps contribute to our PI problems.  Other indicators suggest that our alignment is mostly OK: the arm power, PRG, coupled cavity pole, and kappa C all seem to be similar or slightly better than before the vent. 

I tried moving the BS camera pitch offsets, during the thermalization (our locks are short enough that we have to do things during the thermalization we might rather do later.)  This did seem to improve the arm power (more than the thermalization trend), but if anything it made POP18 slightly worse.  Screenshot attached.  We lost lock before being able to try yaw. 

For future reference, the ndscope I used for this is in userapps/asc/h1/templates/ndscope/move_camera_offset/move_camera_offsets_BS.yaml