Complex in-space repair underway

The crew of the ISS has no easy task after a major cooling pump module failed. There are spares on board, but it's taken two spacewalks and will require at least one more to remove and install all the necessary hardware.
COMMENT: On the one hand, this shows how complex and difficult it can be to keep a large human-occupied structure in space: on the other, it shows what human beings can do on site when things hit the (temporarily shut down) fan.