Before flipping the turntable upside-down, get a large soft object (ex. pillow, blanket, etc...) to minimize the possibility of damage.

Using a #PH1 Screwdriver, remove the 8 screws marked

When removing the 8 screws, there will be 8 brass bushings that are to be placed back on the screws before reassembly.

When removing the bottom cover, you will likely need to tilt the cover towards the back (side with the RCA cables) in order to get the cover to move around the ports.