What exactly us going on with the sound card?
They are pretty basic you should be able to repair it unless it's broken in half.

Back on this again guys - looking for some pointers on where to look to try fix the issue.
Sound card is only giving 1 sound effect. Have replaced U1-U4 and U17 & U18.
Test Voltages are:
TP1 4.86V (4.86 on MPU and 4.93 on SDB)
TP2 0.19V (should be 2.6V)
TP3 2.54V
TP5 0.21V (should be 2.6V)
TP6 4.94V
TP7 14.5V (same as SDB)
Short on replacing all IC's and components on the board - any pointers on where to look to restore the correct voltages on TP2&5 would be welcomed.
Thanks!