This morning Ed asked me to look at some trend plots he had just generated.  Clearly noticeable was a sharp
rise in the humidity and a drop in the flow rates for the heads.  I checked the crystal chiller and its
water level was below minimum and the controller displayed an error informing of such.

    Attached is a picture of the burst hose attached to the head 3 water cooling circuit.  This is the same
connection that failed ~2-1/2 years ago.  I do not recall if it has been adjusted since that time.  Although
care is/was taken to prevent twisting of the hose when the fitting is tightened, it is highly likely that
there was a small twist in the hose that exerted a small shear resulting in the tear seen in the picture.

    Also attached is a picture of the 4f lens for head 4, clearly showing some water droplets on it.

    Apart from the obvious step of replacing the hose, the turbine flow sensor for head 4 will also be
replaced.  The laser will take the better part of a day to dry out - to be on the safe side.  All optical
surfaces and the fibre bundle tips will need to be inspected for cleanliness before any operation of the
high power oscillator is contemplated.