Full Recovery of RHESSI operations RHESSI has now been brought back to a fully operational state following an anomaly that occurred in the power system on 16 March, 2010. All nonessential components were automatically turned off at that time including the cryocooler that keeps the germanium detectors at their operating temperature below 100 K. As a result, the detectors warmed up to near room temperature, so the opportunity was taken to carry out a planned anneal of the detectors by heating them to 100 degrees C for 10 days. This allows the detectors to recover the energy resolution and sensitivity lost by radiation damage accumulated since the first anneal in November 2007. Since this is the first time in 8 years that the cryocooler has been off, we also did a bake-out of the cryocooler before turning it back on. Following this second anneal, the detectors were cooled down to their operating temperature and the high voltages ramped up to their nominal values of ~4000V for all nine detectors, something that was not possible even when RHESSI was first launched. Solar X-ray and gamma-ray observations were resumed on 1 May, 2010. Preliminary results based on the detection of a couple of small C-class flares show that all nine detectors are fully operational. The effects of radiation damage accumulated since the last anneal in Nov. 2007 have been largely eliminated. The sensitivities and energy resolutions of the detector front segments are all similar to those that we saw immediately following launch in 2002. In fact, detector #7 looks better than it ever has, even better than it was before launch. Detector #2 was essentially dead prior to the anneal and, although it still has poorer resolution than the others, has recovered to the same state it was in at launch. Thus, RHESSI's X-ray imaging spectroscopy capabilities from ~3 keV to well in excess of 500 keV, are better than ever, better even than when the detectors were first turned on after launch. Based on the background spectrum that includes several narrow gamma-ray lines, it is clear that the rear segments have recovered to the state they were in around December 2004. Their energy resolution is about a factor of two poorer than it was at launch but more than adequate for detailed gamma-ray imaging spectroscopy up to RHESSI's upper energy limit of 17 MeV. We suspect the power system anomaly on 16 March was caused by a hardware under-voltage trip induced by an electronic noise pulse. Several actions have now been taken to avoid a repeat of such an occurrence in the future but the cause of the anomaly is still being investigated. All systems are now up and running with no evidence of any condition that could have caused such an under-voltage. The cryocooler shows no signs of any degradation in performance as a result of the abrupt turn off or the subsequent detector anneal and cool-down. The final detector temperature reached is presently a few degrees colder than that achieved immediately prior to the anomaly. In conclusion, we are very happy to report that RHESSI is back in action. We expect that it will be capable of similar X-ray and gamma-ray imaging spectroscopy of solar flares as in the past. Furthermore, the success of the anneal process has given us greater confidence that several future anneals will be possible, perhaps on a yearly basis to limit the build-up of radiation damage that we have experienced in the past. Brian Dennis & Bob Lin