I tried everything and I can not figure out where the smoke smell is coming from on my Winslo PS40 pellet stove. everything is cleaned, and sealed????? any suggestions? I think I smell it at the 45 elbow. its all caulked. i do not see smoke but i smell it in my home. I sat there in the dark with a black light trying to see If i could see the smoke. any and all advise will be appreciated.