Bosch 2460 - How do I remove the motor

How do I remove Bosch 2460 motor? I need to replace the carbon brush. I have removed the back panel, belt, and screws but the motor is not budging. I even tried a small flat screwdriver but it is marking the drum plastic but the motor is not moving at all.

Please note that I removed two screws from the front of the motor where it seemed to be attached to the drum. Are there any other screws?