The science journal Nature has some more details of the issues we’re having with the HIFI instrument on Herschel.
Bottom line is that HIFI are still trying to understand the problem, but can switch to the redundant power supply and things should work again. In the mean time PACS and SPIRE are doing fine and their PV phase work has been accelerated. In fact, some science observations are beginning to be taken. For one of the programmes I’m involved with some were taken on Sunday, though we won’t get the data to look at for some time.