My West Marine inflatable dinghy (non Hypalon) has develpoed a crease-like indentation in one of the tubes near the bow. It is about an inch deep and six inches long. Depite the tube being inflated all the way, the crease remains. It is about nine years old and has been well cared for. It has not been run into a dock, boat, etc. A call to a local dealer did not provide much information as to the possible cause or if it is repairable. Perhaps it is time to replace. Any input would be appreciated.