The speakers are located near the front of the laptop, and connected by separate cables.

There is only one screw that is holding the motherboard to the casing, and is located by the Wi-Fi module at the front/left of the laptop. It is indicated by an orange circle.

There is tape near the front center of the laptop which is the last thing holding the motherboard in place after the screw has been removed. Give it a tug, and it will give way.