Hmm... I wouldn't take it to the dealer. I am not sure why yours is leaking, but I did not have to soak mine and it doesn't leak a drop. I have never heard of soaking it in coolant for 24 hours... has anyone else heard of this?!?!
Sorry I'm not much of a help, but maybe there is damage to the surface on the engine where the water pump touches?
Good luck,
Reebs
