2 astronauts did a spacewalk to investigate ammonia leaking from the International Space Station . They found the source of the leak and replaced a pump controller box on the station . Afterward , initial tests showed no sign of a continuing leak , which was spotted later , . Moreover , the agency has said the rest of the orbiter was otherwise operating normally . 5 of the 6 men involved in the 5Â½-hour spacewalk are set to leave for Earth on Monday .
2 astronauts did a spacewalk to investigate ammonia leaking from the International Space Station . They found the source of the leak and replaced a pump controller box on the station . Afterward , initial tests showed no sign of a continuing leak , which was spotted later , . 5 of the 6 men involved in the 5Â½-hour spacewalk are set to leave for Earth on Monday .