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Could the water be running off the solar panel into the vent pipe and then leaking at the joints? It’s one of those older looking cone shaped vents that then has a straight pipe up out of it. How is the black PVC vent pipe connected to the flashing and external pipe normally?
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The Henry stuff is just what you need for repairs while its raining.
This is to clarify if you are confidant that the leak is running down the outside of the vent pipe inside the attic.
You did mention that your roof was just several years old. Normally, the ‘cone’ flashings hardly ever leak. If they do, its an old house and they have rusted.
They are replaced with a new roof. The storm collar is what fits around the protruding center vent pipe and over the cone flashing. They are also called roof jacks.
Some guys will fill the gap between flashing and vent with the Henry goop and will seal for years.
Rain entering the actual vent simply runs through the house sewer pipe. Possible but doubtful if they forgot to glue vent sections.
I would however, be very suspect about the solar panel roof connections.
Watch for water running a great distance down rafters. This may be something that flu could look for as well. A high roof leak can appear far away from where the water starts dripping.
As mentioned, all bets are off with the wind. Hard to find these type of leaks.