This is how I found the leak in my system. We were out on anchor for a quick overnight. I smelled the propane and told my wife to stop cooking. We disconnected the tank, opened every port possible, and tried the best we could to air out the cabin. It was very faint, but I didn't want to mess around with it.
Once I had everything torn apart, we noticed multiple cracks in the main supply line. We also found quite a bit of junk behind the steel oven box including rotting juice box I don't think has been made for over 20 years and a package of cheese and crackers that was probably from around the same time. At the end of the day, I'm not sure if I was smelling the rotting food or the propane tank. Either way, we ended up with a new propane system complete with a sniffer. We all feel much safer now, both from the improvements in the propane system, and removing the rotting food.