Yes, just cut and explore slowly if you dig out from left to right between the stringers and front to back from under the seat to the extent of that soft spot you can affect a repair.

First try to get some pictures uploaded, we dont want you to create more work for yourself, plenty of people on board can guide you to a solution. Plenty of threads here on rebuulding re foaming and glass work.

No wooden stiffener in composite stringer boat the floor pan has the seat platform molded in. You can see where they holesawed and filled the front with foam in this and the following pictures, also you can see where i hole sawed to explore in the beginning.  

In this picture you can see where the factory poured foam into the cavity under the front floor pan, oh and the silicone they used to fill gaps.

Same here, factory foam filled patches and silicone installation

Note where silicone does not get er done drywall screws are jammed thru the floor pan into the stringers similar to how they used the nail/staple gun to attach wood stiffeners to wood stringers in every boat up untill composite era.

Here you can see factory hole sawed foam poured area from pylon forward, note massive voids

More of the same up close driver

More of the same up close passenger

Big void directly under driver seat.

So likely wood stiffeners with nails foam filled, sand3d smooth and covered with csm OR, floor pan with silicone and screws hole sawed kinda sorta filled with foam and then patched.

Very different materials in construction, different sequence of contruction (wood v composite stringer transition 92 to 93 stiffener v pan) but stringer location very close (in fact if the 92 wood and 93 composite use the same engine/pylon mount the stringers will absolutely be in the same place).

While there will be some difference, it's not a huge step in any direction, the same guys assembling the same way with different tools and materials

79 nautique looking aft, note stringer and wood stiffener location foam filled sanded and covered in csm

96 nautique looking aft, note stringer location foam filled sanded covered in csm (your 92 may or may not have wood stiffeners in the rear since the aluminum angle on the composite stringers supports the filler panel that gives access to the bilge.

79 nautique looking ahead, note stringer location, red outline is location of wood stiffeners at pylon and front seats ( did you say you found rotted wood and wet foam in this area)

96 nautique, looking ahead, note sringer location, foam filled sanded and covered with csm up to the pylon and i'd bet every composite hull has the floor pan, the 92 may have wood stiffener and be be foam filled sanded sanded and covered with csm up to the bow eye. 

96 nautique with some stringers cut open, basically the composite stringers are filled with foam, sanded, bonded into the hull, then either the front floor pan or foam from transom to pylon would be next but in what order i don't know.

My point is while trbenj is right that there is a difference in construction. The stringers wood or composite will be very close in location and inbetween those stringers in front of the seat you would likely find wet foam or rotted wood over wet foam. 

Care cutting to locate the stringers, dig out the rotted wood stiffener (like in the 79 pic) scoop out the foam and refill and glass to extend the boats life could be accomplished.

Thanks, John.

Here is the picture of my floor.

Dave

I will try to figure out how to attach a photo