There has been a water stain in our laundry room since we moved in. I marked the edges and noticed it had grown. So I opened a hole where I will have to replace the sheet rock to try and find it. There is no access to this part of the house because there was a sun-room added on and you can't see it from the attic. I was able to see it by sticking my phone up in there. It looks to be coming from the water heater vent. I went up top and looked and all I can see is possibly where the seam is on the vent pipe going through the boot. Any expert roofers on here have any ideas? From where I could get my phone through the whole I cut next the old roof I can see water running down the old shingles around where this pipe is but I can't see it on the new roof.