"The damage affected the outer skin — apparently either micrometeorite or space debris damaged the radiator, which led to a leak of coolant — but so far this is a preliminary conclusion of our commission," Borisov told Rossiya 24 television channel.
The official added that the temperature in the living compartment of the Soyuz MS-22 spacecraft is currently 27 degrees Celsius (80.6 degrees Fahrenheit).
"Today I talked to the cosmonauts, they confirmed to me that the temperature in the living compartment is 27 degrees," Borisov said.
On December 15, a leak from the spacecraft’s cooling system occurred due to damage to the outer skin of the ship's instrument and assembly compartment.