Hi Gillaine
I have rebuilt a circuit board for a 325 and quite honestly they are a bit primitive , just a PCB will extra solder on the tracks to help current capability and voltage drop resistors for the LED's . If as I suspect ,you have the same press buttons on the panel, these include a thermal cut out/breaker. After 20 years maybe they fail. Does the LED indicator come on ?
The good news is that the breakers are still available (e-bay)
Jan
325/32
Blue Moon