If they discover the fault is electronics, the party will be over. First it was floor mats then it was a mechanical gas pedal part. The throttle function, as I have read, on these things are controlled by electronics (drive by wire) so it may not be over yet.
I really believe that the problem lies in the PCM. Some of the RAV4’s (or more)had a failure to respond to the throttle problem and my guess is that these are related to the acceleration problem.