Water in buoyancy void?

[khris.johns]

I have a 2001 180BR Sea Ray. Great condition, only 73 hours on the boat. Hull is in perfect condition with no impacts or damage. In the deck storage (ski storage) compartment located through the floor, there are 4 plastic plugs on the side of the compartment (2 on each side). I'm not talking about the bilge drain plug that goes into the engine compartment. The plugs are about 4 inches from the bottom of the actual compartment, on each side. One of the plugs was slowly leaking water so I took it out and now can pull about 6-8 ounces of water out of the compartment each night. The boat sits on a trailer in my garage so no water intrusion. I bought the boat early this summer and it had been parked outside for most of it's life. The compartment was dirty until I cleaned it up. My suspicion is that the prior owner at one point let that compartment fill with rain water and some leaked past this one plug.... any ideas for getting all the water out, or if I'm looking at major fiberglass damage/delamination??? I can't see any signs of weak fiberglass or damage.

Thanks for any advice.