White knight eco86A not igniting?

White knight Eco86A. The ignition clicks at the start of a cycle but doesn’t always ignite. It does eventually after opening the door to stop the cycle and stating again, sometime up to a dozen times. Engineer visited and said it needed a PCB. No longer made as manufacturer is no longer in business. Reading other posts, folks mention thermostat and sensor but not pcb. Is pcb the likely problem as it does work eventually?