I just came across this at the Daily Telegraph. In this post there is a link, if you want to check it out and haven’t found a live feed yet.
They are 3-plus hours into it at this point, and it’s going well. The replacement so far is holding its pressure, they just said.
Edit: 12:46 p.m. Eastern. Here’s the NASA link.
It sounds like everything has gone well and they succeeded. It will be a long process before they actually start running the cooler again.
They’ve been at it for 6 hours now – they must be tired. Ordinary mortals would be exhausted. I think they’re wrapping it now, though.