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Light_EDDed
Armchair faultfinding is not a precise art and I'm certainly no expert.
That said, the part most vulnerable to earth leakage is the heater element.
The grounded boiler is typically protected from mains by ceramic powder. water dripping inside a machine where the heater element enters the boiler dampens ceramic and trips your RCD
disconnecting the element and checking resistance to ground would show a gross fault.
Another approach might be to replacing the element with a known good load (e.g. mains light pendant) if the bulb lights up then you know it's the boiler heater - if it still trips, you'll need to look elsewhere.
Repairs could perhaps include removing the boiler and sticking it in the over for a few hours at about 100degC... alternatively you'll need to find a replacement boiler
Needless to say go super-careful with mains power - also do a bit of googling, i doubt there's much difference in principle between this and more documented/discussed machines
Years ago I fixed a similar fault on a FrancisFrancis based on info from a Gaggia classic.