Vladimir Solovyov said the "scientific research" would seek to identify "vibration nodes" to see if they coincide with welding seams. He told Sputnik earlier that persistent air leaks were a likely result of welding errors made inside the Zarya and Zvezda modules three decades ago.
Cosmonauts were first alerted to a tiny crack inside the Zvezda module at the ISS in 2019 when a drop in air pressure was recorded. Two cracks have been identified and sealed off but air is still escaping the space outpost, albeit at a slower pace. The leak poses no danger to the crew.