HI I just ran the test again on mine and found nothing out side so I will have to move inside with some soapy water and a spray bottle.But to answer your question about smoke testing, I and my Dad kept bee's He passed last year,
and the bee stuff has come in handy.just find some one who has a bee keepers smoker I took mine and added a cooper line so I could get a smaller
stream of smoke find a leek and it will suck the smoke in much safer than spraying flammables all over the warmed Eng.Plus the harsh chemicals do harm the rubber seals and if they are already week,well you know.
j-n-t