Considering that the owner's wife said that she tried the brakes but they weren't working I am pretty sure there will be brake usage logs coupled with associated acceleration/deceleration data. That should tell us if the brakes were applied and if they were working. The acceleration logs will also show if the acceleration pedal was engaged at the time or not. I am assuming that an auto acceleration log is different from a hardware pedal usage log. If not we can't determine if the acceleration was due to software or hardware.