I’m not familiar with the machine, but unless there are spares readily available, it’ll be a tricky thing to fix. Finding the fault itself could take a while. I’d probably endure for the sake of curiosity, but you’ll want a multimeter to start trying to chase down the fault.
My guess would be a problem/short with the heating element.
I reckon it’ll be tricky thing to sort out tbh. Good excuse for an upgrade?