[Kimura and Yasui]
 On February 3, the consumable parts of the helium compressor for the duct shield cryo-cooler unit were replaced.
The consumable parts are the adsorber and filter unit. The compressors serviced were four units: Xfs, Xfa, Yfs, and Yfa.
 On February 4, the helium gas inside the cold heads of the duct shield refrigeration units was replaced.
The cold heads whose helium gas was replaced were Xfs and Yfs. The pressure of the helium gas in the cold heads is 15 bar. 
The grade of helium gas used was G1.
　Replacement of the helium gas in the cold heads of Xfa and Yfa is scheduled for February 5.