Two Worcester Bosch Boiler questions - no power and a leak!

I wanted to say thanks for the help sorting my partner's Worcester Bosch 28i junior that was leaking last year, it turns out it was the pump housing.

Anyway, whilst it's been working fine for a year with no leaks, it decided to stop working a few minutes into the timer coming on the other morning. Basically it looks dead power wise, no lights, no sounds. I've checked the power to it uisng a multimeter and it is getting power and the fuse (s) on the PCB look intact so I'm wondering what else it could be? Do the PCBs typically "go" like this?

I've got a gas engineer out to look at it this weekend but if there's anything I can check in the meantime then I'll do so.

Thanks

Dan

Have you checked that the blue transformer is working?

Thanks and no. Excuse my ignorance but the only blue thing I can see on the PCB is a rectangular plastic thing with two silver cables going into it with clear sheathing.

Dan