Yes they can be fixed.
Powersurge? what happened.
Are both relays closing?
The large transistor drives the motor (on the heat sink) They can give problems,
Also the off board pot.
Check all tracks and soldered joints on the back of PCB, VERY closely magnify.
Check all connections.
Exactly what have you tested so far? And results?
Also that zener diode looks a bit dodgy.