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Air leaks in the Zvezda service module were first detected in September 2019 and increased the station's air loss rate to 1.35 kilograms per day.
The increased air loss was traced to a transfer tunnel between the Zvezda module and a docking port, with repair efforts failing to resolve the issue.
Cracks in the Zvezda module are located in a 'low stress part,' raising concerns about the module's long-term structural health.
The cause of the cracks in the Zvezda module remains unclear, with potential causes including fatigue, internal damage, external damage, and material defects being explored.
The Russian Multipurpose Laboratory Module (MLM) Nauka docked to the International Space Station’s Zvezda service module at 9:29 a.m. Eastern on 2021-07-29.
The Zvezda module was launched in 2000 and is equipped with living quarters.
NASA scheduled the station’s crew of NASA astronaut Chris Cassidy and Roscosmos cosmonauts Anatoly Ivanishin and Ivan Vagner to remain in the Zvezda module from the evening of 2020-08-21 until the morning of 2020-08-24.
The Soyuz MS-13 relocation maneuver was the first Soyuz relocation since August 2015 when Soyuz TMA-16M moved from Poisk to Zvezda.
Alexander Skvortsov will board Soyuz MS-13 docked to the station’s Zvezda module on 2019-08-26 and manually dock Soyuz MS-13 to the Poisk module to free the Zvezda module’s port for a Soyuz MS-14 docking attempt.