I own a 2014 Jayflight 19RD. It has a black Atwood propane /carbon monoxide alarm on the base cabinet beside the exterior door. We have owned the trailer since January. The green light has been on during the three times that we have used the trailer. Both of our sons, and their families have used the trailer once. The alarm has never gone off for us. It has happened to both of our sons. Once two nights in a row. Is there a way that the unit can be tested? Would turning on a propane torch close to the unit be a valid test? Also, we leave the trailer plugged in with the propane on stored in the yard. The alarm has never gone off in the yard.The trailer has a second CO alarm above the dinnette that has never gone off. I have smelled in the area under sink and smell no trace of propane. I'm willing to replace the alarm, but I would like to know that the one in the trailer is bad. Thanks in advance for any thoughts or suggestions,