The drive is the red and black plastic enclosure below the thoracic area. The status indicating LED's are only possible to see from the side of the table opposite the control box and you look from just the right angle. If you cannot see it refer to the bottom of this page.
There are two LED's. The one closest to the corner is green when there is power to the drive. The LED closest to the large round capacitor (see arrow) blinks a particular color and pattern to indicate the status of function.
To access the drive you will need to remove the plastic enclosure from around the top frame. Use the pedal to elevate the table. There are two screws at the head end, near the arm rests, two screws at the foot end of the plastic, and one on each side. Pull the plastic down and away to free it from the arm rests if you want maximum visibility.
CAUTION: The table must be plugged in to observe the LED's so use caution around the electrical components.