Shuts down the Autoguider and warms the chip up.
2=to: 2!:}Format: SHUT-DOWN
2=to:
2!:}Comments: Starts a shut down sequence for the Autoguider by
warming the CCD chip up above 0 
C. This
process takes about 5 minutes and the observer
should check that it works. An alternative
command to warm the chip up is STEMP 20.