If you do have a delamination / separated it could just be a defect and 2"x5" came off. Silicone will not likely stick too well. I would try something more like 3M rubber adhesive, like they use to adhere rubber door gaskets on a car.
Very schepticle I think if it delaminated you will see more in the near future. If it is not a high milage sled chance it. If you can be stuck many miles out spend the $500 and retrack it.
"Meaningless Ride"