Floor inside the cabin area

[Rusty5387]

Hello all! I have a 1993 V21 and thought I was in good shape when putting it in the water for this years season however I noticed some rotted wood inside the first storage hatch inside the cabin and then the other day the entire hatch cracked when it was stepped on. Is the entire floor in the cabin wood or fiberglass? Has anyone had any issues like this and if so what kind of changes or repairs did you make? Thanks in advance for any information!