Problem(s) Encountered:

...I did have some trouble with the autofocus.  I disabled it in the middle of the night and touched up the focus, and when I enabled the autofocus again, it drove the focus out by a couple hundred microns.  By that time the truss temperature was pretty stable so I turned it off.

Solutions:

There are some known bugs currently in the temperature-compensating focus routine.  These should be addressed as time permits but until further notice, this feature is a use-at-own-risk.