Made a small modification to a pre-modecleaner servo that reduced the boost gain by
lowering its corner frequency.  Installed the servo and couldn't lock the pre-modecleaner.
After about ~15 minutes of trying, I gave up.  The original pre-modecleaner servo was
re-installed.  With it I noticed on the CCD camera that the alignment had shifted.
Re-aligned the beam into the pre-modecleaner, checked alignment onto the locking
photodiode, re-locked the pre-modecleaner.