We’ve got a approx 2yr old leisure roma 100 range oven (bought 2nd hand a year ago). The right hand (non-fan) oven has started tripping the cooker circuits RCD in the distribution unit every time it’s turned on as soon as it’s turned on. All the other hobs and the fan oven work fine. Can anyone suggest what the problem might be and how to check it? I’ve got a bit of experience with electronic and electrical work and am not without a clue when it comes to knowing how to use a multi-meter etc.