i have a small 13ft avondale 360le, 2berth,the floor in one place has gone a little spongy,has anyone ever done a repair on the floor,if i cut out a square in the soft area are there any wires etc underneath?,then can put cross beams in and put back the piece i cut out...any ideas or suggestions...please email me .mikeandjudy59 at aol.com thank you..mike