This morning I saw that Ed had added 350 mL of water to the PSL crystal chiller; Peter had added 200 mL of water to the crystal chiller yesterday.  This is much more than is usually required for regular chiller filling, so after discussing this with Jeff B. and Peter, I went into the PSL enclosure to look for a leak.  Sure enough, there are 2 leaks in the PSL water manifold; a slow one where the supply water line attaches to the input of the manifold, and a quicker one where the return water line attaches to the manifold output.  The PSL and chillers are now turned off, and Jeff B. is in the enclosure fixing the leak.  Once this is done the chillers will be turned back on to test the fix; if the fix holds, the PSL will be restarted.