If you want I can take a look at it for you - it's the postage that's the problem. Alternatively get a new one, stick the old board / Amiga on EBAY and describe it as is - then someone like me can buy it and repair it =)
I will bet its salvageable - it's a question of looking closely at the PCB to check the damage and use a multimeter to check connectivity against the circuit diagram and what can be seen of what's left of affected traces.
