From Jim P: “We've made plans to replace the cold head on the S/X receiver - which is basically stuffed. It won't holdeth the coldeth without a vacuum pump for more than half a day now. The most likely cause is a helium leak. So the plan is to remove the S/X on Friday the 26th, replace the cold head with a refurbished one, and then put it back on March the 17th (yes it's a big job). If this is going to cause a problem, let us know ASAP.”