Shinobi PCB Audio

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I have a sega system16 shinobi pcb.

This has been plaguing me for awhile now so I did some research on the board and took some photo and video to help. I am trying to troubleshoot what is causing my sound issues.

I have game sounds but no music.

Here is a link showing some game play and the sound issues.
https://youtu.be/sqhK7aNS7dw


These are my thoughts...

The main cpu is labeled SCN6800can64
If it was bad, the game would probably not work

This leaves....

1) 18 Eproms are on the daughter board (11 right / 7 left)
2) the yamaha sound chip YM2151
3) the z80 chip labeled NEC D780c

Could a bad one of the 18 eproms be causing this?
Could the z80 be bad?

..if its not as simple as swapping a socketed part, I need to send off my board and would take any recommendations on who can fix this. I can replace eproms and check voltages but other than that I am not a technician.

Thank you for any ideas,
Chris
 

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