[RayChez1]

All compartments have drains, so if you had a leak you would have seen water pouring out. Check your water gauge, it might not be giving you a true reading and if your water pump was running then either the gray tank or black tank would be filled all the way to the top and into the shower. If your water tank was full 100 gallons and all of a sudden it is empty, if it went into the black tank 55 gallons it would over fill the black tank. If it went into the grey tank 65 gallons, that would also be over filled. So I narrow the problems to a bad gauge reading.