I’ve had to fix a few of these sound cards now. First one was in a gold ball. Recently did another in a Grand Slam that I’m rebuilding. There are a couple variations of this card. Main difference are the way the traces are routed on the back. One of those has traces close to the mounting holes. Was frustrating on the Grand Slam since the board was repaired on the bench but would fail after installing. That is when I found the two variations. The version with the traces close to the mounting hole can short on the mounting tabs and either prevent some or all sounds or even damage parts.
On these boards I have had to replace one of the 8910 chips and on another one of the 6810 chips, PIA, and DIP sockets. Also check for tarnished leads on the ROM chip.