successfully removed a faulty pump on the space station. >> night work. >> reporter: a new pump was supposed to be installed today but will be delayed until tomorrow after a potential problem with the space suit was discovered saturday. >> the only issue that i personally am having is it's very, very cold. >> one of the suits showed maybe a sign that it got a little water into the evaporator on the back which cools the suit when you're outside. >> reporter: they say the astronaut wasn't in danger and that it wasn't related to what happened in july. a reminder of the dangerous nature of the work being done 220 miles above earth. >> as trou knot is off structure. >> what do i do? >> reporter: the recent hit movie "gravity" puts a highly dramatized spin of the risks.