zanussi zdm 869x tripping breaker

hey fellers , i replaced a fan oven element on this cooker yesterday , and an oven bulb , the customer rang a half hour later to say the cooker was not working , i went to look at it and it had tripped the breaker , i reset the breaker and turned on the cooker, and the bulb i fitted had blown ! and as soon as i turned the fan oven on the temp. pilot light went out and i heard a click , so i took the back and top off the cooker to investigate and no power coming to the element ! , so i removed the cable tie holding the wires together to trace the element wire and it seemed ok , then turned on the switch again and off it went power to the element and fan and element working fine ., a short me thinks checked all wires looked ok left oven on for 20 mins all ok put it back in the press cavity and it is still working , any ideas guys ? thanks a lot