Defy 500 trouble.... Ive just replaced an faulty single element on the bottom of the oven... it worked well. After about two weeks the oven started to trip the earth leakage; so I replaced the top element (double) + the thermostat-switch... only one of the top elements are working. Still it keeps on tripping direct on to the earth-leakage.. Ive decided to disconnect the bottom element from the system to get an idea what is going on... whala... it is not tripping anymore, still only one element is working (without the bottom one) so Ive tested the single bottom element with my tester on continuity and it give me a buzz witch I believe is right..But, when I reconnect the bottom element it is still tripping the power... Where do I go from here???