The most likely reasons for the leak is a failed pump or a fluff blockage somewhere. The machine won't leak for a while as the "sump" in the bottom of the machine slowly fills up, then it pisses all over the floor because the pump isn't emptying. You need to get to the pump and check it. If it checks out OK then it's a blockage and you need to strip more of the machine which as far as I can see is made like a Chinese puzzle.
If the fan is really stuck fast the standard way of proceeding is apparently to carefully smash the fan and replace later, though be very carefull not to bend the shaft. This one of the reasons that White Knight tumblers have a poor reputation when it comes to servicing. Next time I pay more and get a Bosch.
A piss*d off White Knight owner., October 2007