We have a 2003 Beneteau 473. One of the burners on our 3-burner stove won't stay lit. It will light as long as you depress the burner valve, but as soon as you release it, it goes out. I've read online a bit and there appears to be something called a thermocouple that is involved in keeping a burner lit. If this is the culprit, anyone have experience replacing it?