Start with the two purple areas on the low left side of the image. The bottom one id the express card slot and the top one is the DVD connector. Remove the silver screws shown as circles in the image, and pull the PCBs laterally following the red arrows direction.

Disconnect all 3 cables shown as red boxes on the image.

Finally remove the speaker plastic holder (long black plastick marked in red at top of the image). Two silver screws have to be removed first (red circles in red area).