Of course it is highly unlikely, i understand how rigorous aircraft maintenance must by necessity be. That said, this is whole event was highly unlikely and maintenance work on the plane must be considered, especially considering the planes past incident and the recent 777 directive. Mistakes can happen (and have happened), even very small ones, and while they may not directly cause catastrophic failure they can often lead to a chain of events which results in the loss of the aircraft.
I'm not saying this is was brought the plane down, i have nfi what did really, but i think it is something worth consideration and a far sight more plausible than half the other bullshit being slung around the internet at the moment.