It has been a while. I finished this project last Christmas. After testing the board, I couldn't determine which audio component was broken. So, I replaced the whole audio board circuit and it works great now. To replicate the process, everything in the shaded area must be removed. Save the big heat sink because we will need it later.

I purchased a TDA2030A Amplifier Board DIY Kit from Amazon. I populated the right-hand side of the board. I did not use the audio input jack and horns because I soldered directly to their pins. I also didn't solder the potentiometer and LED. When finished I used the heat sink from the mainboard and connected it to the TDA2030A on this module. You will need to drill one hole in the module's board. The hole placement will be through the circuit of the unpopulated left-hand side. Secure the attached the module's board with a screw. I used Loctite but this may be overkill since the TDA2020A is also screwed to the heat sink.

Solder to the following points on the board. The audio input signal on the audio module is connected to the lower pin at C27 on the mainboard. The audio output signal from the audio module gets connected to the negative pin where the large 2200nF capacitor once sat. Power to the audio module is connected to unpopulated capacitor pins shown in the lower right-hand side of the photo below.

Now for the moment, you have all been waiting for, putting it together. If you did everything correctly, all you need to do is flip the audio module upside down and line up the large heatsink's top holes with the mainboard's heatsink holes and screw it on. Please make sure that nothing from the audio module is touching anything on the mainboard except the large heatsink and the wires connecting the two boards. Test and enjoy! The tree sounds better than ever and nostalgia lives on.