Ive got a very similar issue with my auto box, i went to a play day yesterday and went through some water, on the way home it started to leak fluid, then i stopped for a few minutes and it developed a leak from the bell housing, then wouldn't change out of first, then to top it off i lost reverse !! . Left it overnight, thoroughly jetwashed every inch of the vehicle, took it out for another drive, it would't change out of first gear for roughly a mile, then all was fine, but leak still persists.
Sorry bimotaman but i can't help you as i haven't found a cure to mine yet, will post if i do manage to get it to work through the gears from cold.
Dan.