My car was recently flooded by a river up to the seats, the water stood like that for 24hrs before subsiding. I have got the car running and driving fine and all dried out, I've had to replace some of the electrics modules but all seems fine. I'm wondering as the water came over the auto gearbox as a precaution should I get the fluid drained and re-filled just in case water has seeped in past the seals on the top of the box where the level enters the box?