As per alog entry 40022 the oscillator shutdown this morning.
The laser status screen indicated that there was a power watchdog trip and a head 1-4 flow error.  Looking at trend data for the flow rates
through the heads, the lowest one was head 3.  However its flow rate was relatively constant for the previous 12 hours - the increase at the
end is because I restarted the crystal chiller to see if there was a blockage in the system, because previously I remembered all the flow
rates to be around the 0.7 lpm mark.  My conclusion is that the power watchdog was tripped because the injection locking broke (for unknown
reasons at this point in time).

    I was a little surprised to find that the power reported by head 1 was so low and increased the current from 53.9 A to 56.6 A.  This
improved the output of the locking photodiode from ~0.4 to 0.6 V  to values consistently greater than 1 V as the system was trying to acquire
lock.  The servo gain control voltage was lowered from 0.50 to 0.00 V.  At this point it looks like the alignment into the locking photodiode
needs to be adjusted, as the alignment may have changed during the holiday shutdown period as the system cooled down.  I am opting to wait
until Monday to make that adjustment.

    The other servos came back on line without too much trouble.  The power stabilisation requires some looking at however.