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CYOA
Classic neutral to earth fault. It won’t go into fault when there’s no load connected. But any load on the circuit will put current down the neutral and onto the earth at the location of the damage/moisture and trip the RCD.Doesn’t sound like a faulty breaker to me at all.To be clear, you’re saying the RCD and breaker tripped , but the MCB (mini circuit breaker) won’t stay up now (but the RCD can be reset)? One thing that is often missed, is that you need to flip the switch all the way down before it will switch on again (it trips to the halfway position, so needs to go all the way down to reset).
You’d need to have a fault to earth to trip the RCD (current going from from live or neutral to earth). And you’d need to have a fault from live to earth, or live to neutral to trip the MCB, or just have too much shit plugged in (but this doesn’t sound likely in this instance).