Aside from the fact that it is not a "leftist agency" except in the fevered imaginations of some kooky conspiracy theorists, the main conclusion was: "Our findings do not contradict the main conclusions of the IPCC," the report said. "There is ample observational evidence of natural systems being influenced by climate change ... (that) pose substantial risks to most parts of the world." It would be surprising indeed if there were no errors in a report of several thousand pages with such a vast scope. Importantly, the errors have not been in the WG1 portion - the scientific basis.
'Climategate' review clears scientists of dishonesty over data... http://www.guardian.co.uk/environment/2010/jul/07/climategate-review-clears-scientists-dishonesty