I got a call from a customer that he had fire at the front of the oven on his range. I found flames at the oriface and soot in the bottom of the oven. I removed the burners to clean them. When I got them out I found the burners were the problem. They are aluminized burners and the restaurant uses LP gas. That won’t work! I first came across this problem thirty years ago when I was working in the HVAC industry. Aluminized burners rust if used with LP gas.