NASA Space Station On-Orbit Status 6 June 2005
"Update on Elektron: The onboard testing on Liquid Unit #5 (BZh-5) over the weekend has confirmed that the unit is indeed leaking nitrogen (N2) pressurization gas, and it has been declared no longer usable. TsUP is planning to have the crew perform more work on the remaining BZh-7 this week (6/9-10) before it can be retested. If the troubleshooting is successful, Elektron reactivation will be attempted after arrival of 18P (6/18), which is expected to deliver new filters for the Elektron's gas lines, but BZh-7 installation and electrolyte servicing will be done pre- 18P."