My left rear speaker is not working. I did have a problem with the radio once before and I did the disconnect the battery trick, it worked. Now my left speaker cut out. I took it off and tried it on the right side and it worked. I checked to make sure the connections were tight. Do you think it is a channel out on the radio or just a loose connection at the stingray? What do I have to remove to get to the actual radio connections? I have never taken the tupperware off. Is my first time coming?