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Astronauts Heidemarie Stefanyshyn-Piper (L) and Steve Bowen (R) work during the mission's third spacewalk cleaning and lubricating the International Space Station's starboard Solar Alpha Rotary Joint and replacing trundle bearing assemblies in this view from NASA TV November 22, 2008. Inside the station, the crew continues to transfer equipment between the two spacecraft as ground experts troubleshoot an issue with the station's new Urine Processor Assembly (UPA), part of the system designed to process urine, perspiration and hygiene water into drinkable water.