hotpoint aqaurious wf340 is leaking from underneath?

hotpoint aquarious wf340 is leaking when the machine fills and bypassing the drum and going straight onto the floor! when you take the back of the machine away the leak appears to be comming from just above the pump n grey waste pipe from the black bulbous pipeunder the drum on the bottom left hand side! there was a marble left in my sons pocket and this is what has caused the problem! any advice would be great