Use a plastic opening tool and metal tweezers to lift up the ribbon located next to the center-right section of the green board.

Going any further into the camera is guaranteed to destroy the calibration of the sensor box in the camera. The plane of the sensor is calibrated to the plane of the lens elements or lens mount. Adjusting the tension on any sensor box mount screw makes the sensor and elements out of orthogonal alignment.

Remove the CMOS sensor aluminum heatsink by lifting it up with your hands. The sensor, PCB and heatsink are integrated into one unit.

With the sensor assembly removed, you should now be able to be able to see the silver lens cover beneath.