I couldn't wait until tomorrow to finish this repair. 😆 Being a Nintendo board the first place to start with a sound issue of this era board is the 8035 MPU . I don't have one... and they're getting quite hard to come by now but I remembered I bought a bunch of 8039s for Donkey Kong repairs. The 8039 has more internal ram than the 8035 but that's not a problem.
The 8039 brought the majority of the sounds back but no shooting sound. Using the audio probe on the op amps I could hear the shooting sound on one of the inputs but nothing on the output. Replacing the LM324 op amp and everything is now working.
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