Bouncy floor in Mod 1

Thread starter #1
I just purchased an 87 Mod 1. Overall in very good condition. I did notice (of course after I had the boat home) that the floor near the stern, behind the center board is a little "bouncy". No cracks in the are, but the floor definetly has a bounce to it. I'm assuming this is not normal? I did read where there are plywood supports under the floor that may delaminate, but no way for me to see back there. Anythoughts or suggestions for repair (if is in fact not normal)