Engines wouldn't be touched.
Threemile - engines not touched on a "C" check? Seems a bit strange to me.
Just heard that this A/C may have just come off some heavy maintenance recently. (C or D check was due ?) only a rumour at this point, but from a reliable source.
Vapilot - what relevance would a recent heavy maintenance check have in this regard? Although there is a chance of a maintenance error, this is a bit speculative.