Electrolux Steam oven – B9820-4-m tripped electrics

This oven had me slightly stumped, the oven tripped the electrics when you open the door. The oven works fine and heats up well until you open the door.

I checked for insulation and it came back as infinity, I checked the door switch and it appears to be in working order.

then I thought maybe the lights, checked every lamp holder and its bulb, found no fault.

Checked the elements, found no faults

Checked the wirings and connections, looks in perfect condition.

So I am left wondering if there’s an issue with the power module?

thought perhaps Steam ingress via faulty seals but the seals are perfect nick, no traces of water runs.

Any thoughts?
Cheers Matt