I have found that rattles and squeaks are best fixed by myself - a tech in a car for a test drive may not really find the location whereas we are in the car a lot longer and can probably pin point it better.. I had a rattle in the dash that comes and goes and behold it wasn't there when they test drove it - so I fixed it myself with some pads..... They wouldn't even try to fix it as it sounded like Toyota wants specific answers and solutions to exactly what was the problem and the fix....