Went on roof had bought new Lippert turbo 360 vent cover.well when I went to remove old vent assy found pipe was moving investigated pipe was crooked moved and turned. Pulled and pipe came out of roof. Took measurement found behind kitchen cabinet cut hole and that what found pipe had glue on it but none in coupling. They drilled hole so off in roof could not connect had to open hole in ceiling to straighten out.cleaned pipe re glued and installed.How on earth did you find that ????
Endoscope?