Service At 500hrs is to be sure to protect your motor by changing the carbon brushes. To be noted that at 500 hours the vacuum will not stop. But if it continues without service, it will burn out the motor if the carbon brushes aren’t changed
When the light will be red it means the carbon brushes will be more than finished and will start degrading the motor.
But before this happen, the orange light will warn you to change the carbon brushes, which you can do easily at home.
Changing the carbon brushes will make your unit good for another 500 hours of use.