Problem(s) Encountered:

The guider focus did not budge when commanded.  The guider does surprisingly well on not-too-grossly out-of-focus images and no time was lost.

Solution:

That problem had been intermittently occurring for some time prior to this.  Finally had a day off-sky where we could open up the bottom of the MIS for closer inspection.  Initially, all worked as expected.  Guide probe motor mic travel, optical cart travel, etc.  But a little shaking of the wires and power to the motor mic would interrupt.  A little more shaking and one wire completely fell apart.  Managed to splice in a new connection.  All soldered and heat shrunk.  Everything seems to be working again.  Hopefully it stays that way.