I believe you are correct, it may be the miles since oil. however it has had two in that time so i will need to find out how to reset this. also as far as the top. if i insure the back divider is in place and start the car, release the latch and open the top to the first position and then depress the top button and hold it down i get a beep alarm, if i press the button twice then hold it the windows now will go down and i here a gentle click in the rear and nothing happens, and no other sounds.
Joe