Recreational Vehicle Lpg Tank Valve/gauge problems of the 2006 Honda Civic

While my family was driving on the interstate west to California, at 65mph, the engine power was completely lost. Upon pulling over I opened the hood after about 3-5 minutes to find coolant fluid all over the engine. I attempted to start vehicle but it only turned over without starting. We towed it to service center at colfax, CA to find out the next day that the engine has severe internal damage from leaking coolant fluid. The source was not located yet with no signs of radiator damage. The car has been towed 90 miles to reno, nv Honda dealership for further evaluation. After researching possible causes, I discovered a service bulletin (TSB 10-048) that addresses an engine crack leaking coolant and causing engine overheating. I have been advised that my Honda is not covered according to VIN inquiry and awaiting an appointment to look into cause. The engine dashboard gauges never indicated anything out of the ordinary to warn occupants of pending catastrophic engine failure.