https://www.theregister.co.uk/2019/12/03/ams_02/

The European Space Agency (ESA) and NASA astronauts have concluded the third, and arguably most challenging, of the four spacewalks required to replace the cooling system of the International Space Station's (ISS) Alpha Magnetic Spectrometer (AMS)

The spacewalk, which saw Expedition 61 Commander, ESA's Luca Parmitano, and NASA Flight Engineer Andrew Morgan at work once again, required the pair install a new pump to extend the life of the AMS.