dont know if this helps but i was look though cbs folder
2013-02-25 20:45:36, Info CBS NonStart: Success, startup processing not required as expected.
2013-02-25 20:45:36, Info CBS Startup processing thread terminated normally
2013-02-25 20:45:36, Info CSI 00000008 CSI Store 3924832 (0x00000000003be360) initialized
2013-02-25 20:45:36, Info CBS Session: 30282649_269565203 initialized by client WindowsUpdateAgent.
2013-02-25 20:45:36, Info CBS Read out cached package applicability for package: WUClient-SelfUpdate-ActiveX~31bf3856ad364e35~amd64~~7.6.7600.256, ApplicableState: 112, CurrentState:112
2013-02-25 20:45:36, Info CBS Session: 30282649_269877203 initialized by client WindowsUpdateAgent.
2013-02-25 20:45:36, Info CBS Read out cached package applicability for package: WUClient-SelfUpdate-Aux-TopLevel~31bf3856ad364e35~amd64~~7.6.7600.256, ApplicableState: 112, CurrentState:112
2013-02-25 20:45:36, Info CBS Session: 30282649_270345204 initialized by client WindowsUpdateAgent.
2013-02-25 20:45:36, Info CBS Read out cached package applicability for package: WUClient-SelfUpdate-Core-TopLevel~31bf3856ad364e35~amd64~~7.6.7600.256, ApplicableState: 112, CurrentState:112
2013-02-25 20:45:37, Info CBS Session: 30282649_285165230 initialized by client WindowsUpdateAgent.
2013-02-25 20:45:37, Info CBS Failed to internally open package. [HRESULT = 0x800f0805 - CBS_E_INVALID_PACKAGE]
2013-02-25 20:45:37, Info CBS Session: 30282649_285165231 initialized by client WindowsUpdateAgent.
2013-02-25 20:45:37, Info CBS Failed to internally open package. [HRESULT = 0x800f0805 - CBS_E_INVALID_PACKAGE]
2013-02-25 20:45:37, Info CBS Session: 30282649_285633231 initialized by client WindowsUpdateAgent.
2013-02-25 20:45:37, Info CBS Failed to internally open package. [HRESULT = 0x800f0805 - CBS_E_INVALID_PACKAGE]
2013-02-25 20:45:37, Info CBS Session: 30282649_285633232 initialized by client WindowsUpdateAgent.
2013-02-25 20:45:37, Info CBS Failed to internally open package. [HRESULT = 0x800f0805 - CBS_E_INVALID_PACKAGE]
2013-02-25 20:45:37, Info CBS Session: 30282649_285633233 initialized by client WindowsUpdateAgent.
2013-02-25 20:45:37, Info CBS Failed to internally open package. [HRESULT = 0x800f0805 - CBS_E_INVALID_PACKAGE]
2013-02-25 20:45:37, Info CBS Session: 30282649_285633234 initialized by client WindowsUpdateAgent.
2013-02-25 20:45:37, Info CBS Failed to internally open package. [HRESULT = 0x800f0805 - CBS_E_INVALID_PACKAGE]
2013-02-25 20:45:37, Info CBS Session: 30282649_285633235 initialized by client WindowsUpdateAgent.
2013-02-25 20:45:37, Info CBS Failed to internally open package. [HRESULT = 0x800f0805 - CBS_E_INVALID_PACKAGE]
2013-02-25 20:45:37, Info CBS Session: 30282649_285789231 initialized by client WindowsUpdateAgent.
2013-02-25 20:45:37, Info CBS Failed to internally open package. [HRESULT = 0x800f0805 - CBS_E_INVALID_PACKAGE]
2013-02-25 20:45:37, Info CBS Session: 30282649_286881233 initialized by client WindowsUpdateAgent.
2013-02-25 20:45:38, Info CBS Session: 30282649_294993247 initialized by client WindowsUpdateAgent.
2013-02-25 20:45:38, Info CBS Failed to internally open package. [HRESULT = 0x800f0805 - CBS_E_INVALID_PACKAGE]
2013-02-25 20:45:38, Info CBS Session: 30282649_294993248 initialized by client WindowsUpdateAgent.
2013-02-25 20:45:38, Info CBS Failed to internally open package. [HRESULT = 0x800f0805 - CBS_E_INVALID_PACKAGE]
2013-02-25 20:45:38, Info CBS Session: 30282649_294993249 initialized by client WindowsUpdateAgent.
2013-02-25 20:45:38, Info CBS Failed to internally open package. [HRESULT = 0x800f0805 - CBS_E_INVALID_PACKAGE]
2013-02-25 20:45:38, Info CBS Session: 30282649_295149247 initialized by client WindowsUpdateAgent.
2013-02-25 20:45:38, Info CBS Failed to internally open package. [HRESULT = 0x800f0805 - CBS_E_INVALID_PACKAGE]
2013-02-25 20:55:38, Info CBS Reboot mark refs incremented to: 1
2013-02-25 20:55:38, Info CBS Scavenge: Starts
2013-02-25 20:55:38, Info CSI
00000009@2013/2/25:20:55:38.869 CSI Transaction @0x37dce0 initialized for deployment engine {d16d444c-56d8-11d5-882d-0080c847b195} with flags 00000002 and client id [10]"TI6.0_0:0/"