The conditions can be simulated. Check around your area for a shop with a load-cell dyno. This can simulate any load on a drivetrain (within its capacity). Have the dealer issue/install a snap-shot monitor, which will allow you to freeze-frame the PCM during the tests. All you'd need then, is the dyno report to verify the conditions, and a dealer willing to cooperate, of course. Some dealer shops will even have a tech observe the test, once it's set up. You may even get a tech to work "off the clock" to observe the test. It all depends on how willing the dealership and the tech(s) are to see to their customer satisfaction. Good luck!