FS X68030 4 MB - Working but no Sound - $2000

[spuci278]

Sharp X680304 MB RAM

Power supply replaced and Soft Power Chip installed.
Both 5.25 floppy drives have been serviced, tested, and are working.
System passes all memory tests.
All LEDs are functional.

System is working but no sound from the internal speaker, audio out, or headphone jack.
The YM2151/YM3012 tests out fine as well as the connections between YM3012 to YM2151.

You can hear muffled audio on any port with amplified sound. Likely cause is one or both of the preamps and/or a recap of the I/O board is needed.  No visible corrosion of any boards or damage from a battery leak.  Listing on Ebay here: https://www.ebay.com/itm/145705651876

And I would be open to offers if the sale is direct via Palpay.
Please reach out with any questions.  Thanks!