Okay so I was able to work on connecting the digital optical cable from the Samsung BD player to the GT 3.0 system in my travel trailer today.
Before continuing, please be EXTREMELY careful. You might want to shut the power to the GT 3.0 off before attempting the below procedure. I have a good working knowledge of electrical devices and will not be responsible for anyone causing damage to themselves, electronic devices, RV, or Travel Trailer.
Now that I've got the legal stuff out of the way, on to the fun stuff.
Pulling of the bezel surrounding the unit was easier than I thought. Take your time pulling it off starting from the bottom corners slow prying you way to the top. Hopefully you all can see the images in the below links.
There are four screws (as already mention in a previous post) that holds the unit in place. The ones for my travel trailer are regular Philips screws. BE CAREFULL removing the unit from the cabinet as you manufacturer might not have allowed for much wire length to lay the unit on the floor without pulling the wires from the plugs. I used a tool box to rest the unit while working.
Simply locate the Digital Optical connector box on the GT 3.0, but don't remove the protective plug until you are ready to connect the optical cable. Connect the digital optical cable to the optical digital audio output on the back of the BD player and fish the cable down the hole behind the TV. This wasn't that easy because the bundle of wires already passing through the opening and down the wall to the opening where the GT 3.0 is located was pretty crowded. You might want to use a wire hanger of fish tape to pull the optical cable through. Remove the optical protective plug on the GT 3.0 and connect the optical cable.
Carefully place the GT 3.0 unit back in the cabinet opening without damaging or unplugging any of the wires. If you disconnected the power, you will need to carefully turn it back on. Turn the GT 3.0 back on and make sure you have the Sound set to AUD3. You will want to verify that you can hear sound from your BD player before screwing down the GT 3.0 to the cabinet. Turn the power off to the GT 3.0 again. Screw the unit back into the cabinet. Then simply snap the GT 3.0 bezel back on the unit starting from the top and pushing the tabs back into place working you way down. Turn the power to the unit back on.