V berth floor

Good morning,

I have an Edel 4 that I'm restoring and have an question regarding the floor of the V-berth cabin. The last owner installed there an removable depth sounder sensor, the type you can remove the sensor from the thru hull and peak at the bottom of the ocean or sink your boat. Also there is a leak and it seams that is coming from the floor of the V-berth. So my question is: does anyone knows how can I access the hull beneath the V-berth so I can do maintenance/replace the thru hull and check for the leak.

Best regards
Bruno