Looking at the picture, it seems most of the plane
is intact after the fall. Likely they could tell if the mechanical controls for parachute release were defective. Otherwise, the problem could have been a comm failure, electrical intermittent connection, or electronic failure not to mention flakey software.
HA! 33 million dollars per unit?? That include weapons and the little mouse that turns the engine? Theres likely less than 15,000 dollars worth of components and hardware to it. I wonder where the other $32,985,000 fell out? Maybe the gold plated parachute didn‘t catch air. Quite the engineering mark-up.