Success!! I got the sound working! Now I have a good picture and good sound!
I decided to take a chance and very carefully adjust L2, L3, and L5. I turned each just a tiny bit at a time until the buzzing turned into a soft crackling sound. Then when turned the adjustment screw for L5 a little back and forth to try find a good spot, the sound suddenly came to life. I adjusted the fine tuning, and it sounded clear.
Both the picture and the sound are now coming in strong and clear on the same channel! (Channel 3). I finally did it! It took me a little over a month, but I got the tv fully working!