Mutt
Reference Note #182
Thank you for the photo of the throttle quadrant and the explanation of the gust lock.
Given the experience of the pilots and the note elsewhere that apparently they did not do a control check even in a short taxi, which might have revealed the problem, it would seem possible that something outside the cockpit might be a factor.
A control check would have been second nature to them.
Maybe fatigue, get-home-itis, or whatever - or maybe “something” broke at the last second; but why the delayed reject?