Problem(s) Encountered:

While running through systems with the next scheduled observer in order to start bringing him up to speed on using the 1.3m, the x-stage failed on the guide probe assembly.  Checking the log, it appeared that both limit switches were registering as tripped.  

Solutions:

 Pulled the instrument & FW and removed the MIS bottom plate.  Found the

lower-limit (0) limit switch to have essentially disintegrated.  Not sure what happened but it was in many, many pieces.  My best guess is that the switch failed and the guider stage squished the switch.  Pulled the remaining pieces and found a spare to install.  Installed and tested.  All is well again.  Put everything back together.  Will order some spare switches (I currently have two) considering how many are in each MIS.