i have a brand new mercury 2017 60hp. Been out less than 10 times. While driving down the lake Sunday it hesitated and then stopped. Starter will not reengage the flywheel. Tilted the motor up to inspect propeller and hot water came out of the holes where the control cables from the tiller go into the cowling. Got towed in and taken to dealer. Some water still in bottom of cowling and when we removed spark plugs there was water in cylinder. Motor is locked up. Dealer is having a hard time determining where the water came from. They ask me if the boat had been under water. it had not, we were just driving down the lake. Any ideas?