Can someone explain to me the details about water in a boat. My 2008 Moomba Outback always has water under the engine. Also the bilge pump comes on automatically and pumps water out. Does this mean I have a leak somewhere? I had some work done on the boat over the winter and so far the workmanship has not proven to be very good so I'm worried. The shaft going to the prop and some fins and some fiberglass were repaired or replaced from where the boat was bottomed out last summer. The bilge pump never came on by itself to my knowledge last summer but I'm new to all this so maybe I never noticed it. Anyway I'm just in the dark about all the water issues with a boat. Also the ballast bag was never hooked back up by the repair shop. Could this be where my water intake problem is? Also there is this small pannel on the floor between the drivers and passenger seat. It has a plug in it. That area always has water in it. The boat is at the marina and never comes out of the water so I don't get a chance to pull it out and take out all the plugs and drain everything out. Is this something that can cause a problem?

Thanks alot for any help.