From; SpaceRef "There were/are two problems with the new crew return vehicle Soyuz TMA-3. Both are currently under further evaluation: (1) Higher than expected humidity in the cabin atmosphere (18 mmHg) during stand-alone flight; (2) a small helium leak between the pressurization tanks (helium) and the prop tanks of manifold #2 of the integrated propulsion system (KDU). [After discovery of the leak, manifold #1 was used for the remainder of the Soyuz 7S flight. Check valves in the leaking manifold are now closed, i.e., the leak appears to have been stopped. The location of the leak needs to be determined; it may not be in the actual pressurization line but in one of the attached components. As of now, manifold #1 remains ready for undocking & deorbit, and there is also sufficient helium and prop for undocking & deorbit in the closed-off manifold #2. For the six-month period until TMA-3 deorbit, only manifold #1 will be used, the first time in April next year. Implications of the small leak are under investigation, and results will be formally reported by Moscow when available.]"

Sounds like these problems should be able to fix or work around until more is known. The experience of malfunctions from ISS missions is beneficial in knowledge on how to deal with them, especially when trying to solve long term human flights that encounter similar mishaps in the future.

BTW, What's the real story here, found at NASAWATCH ?

If Russia bails (personaly doubt it) what launcher do we use?
SteveS