So, if I understand your problem correctly the water comes in from the vent even though you re-caulked around it, the entire AC shroud and the roof seam. Did the 6 inch tape lap up around the entire shroud or just on the front side of it? If not maybe the water is getting in that way. How long does it have to rain, before you see water intrusion?
I hate leaks and they are frustrating to track down.
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Tim
"A man creates his own legacy. Create a legendary life"
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