Here are all the details on the Hubble problem. "The specific part that failed is the Science Data Formatter, which takes the observational data, formats it into packets, adds headers, then sends it down to Earth at a rate of 1Mb per second. Without it, Hubble can take data but cannot send it to us! It’s not known exactly what piece of the SDF failed, but the whole schmeer is basically on the fritz."
There's a redundant "side B" on board that they will try to get working, but it's not just throwing a switch. The article describes the details.
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