There was a small water leak at one of the (blue) plastic fittings at one end of the deionizer cartridge (gray cylinder in attached photo) in the Crystal chiller.

Re-seating and carefully tightening (trying to make sure not to over-tighten) the connection seems to have fixed the leak.

Topped off the water, installed the stopper, then re-started the laser.  All the servos locked on their own and the MC locked right away.

Seems we are back in business.