I am no dishwasher expert but to me it looks like you are putting the machine into diagnostic mode & when you press the button that trips the rcd you are connecting a supply to some component or other. The first thing I would check would be any ribbon cable that runs from the control panel to the machine body in the area where the door hinges down. If there is no signs of a broken or chaffed wire in that area then the next thing I would suggest is to disconnect & then reconnect components in the machine ( pumps, heating elements, water valves, motors etc.) one at a time until you stop the tripping.
