There are two elevators in the building. Currently only one elevator is working.

Both elevators serve floors A2, A1, 3, 4, 5, 6 and 7
Only the north (right) elevator goes to the roof (R)
Only the south (left) elevator goes to the A3 parking area. If using free parking, this is where your car should be parked.
If you want to go to the roof, and the south elevator doors open, take the elevator to floor 7, get out and press the up button to call the north elevator.
If you want to go to the A3 parking area and the north elevator doors open, take the elevator to A2, get out and press the down button to call the south elevator.