Balcony door
Wind-driven rain at a door is not a riser leak. Write the weather.
A wet curtain at a sliding door after a storm is a common envelope issue. A wet curtain during a shower two rooms away is not. Those two files should not share a contractor on a guess.
Log rain, melt, and wind.
If it only happens in weather, start with the door and the slab edge, not the copper.
Log fixture use.
If it happens during laundry with a clear sky, start with plumbing.
Do not silicone the door and close the plumbing file.
You can trap water in a wall that still has a pipe leak.
Questions people ask
Can a door leak wet the suite below?
Yes. Water on a balcony slab can find the suite under the slab edge.
Is this a ProShield visit?
If the question is plumbing versus weather, a source look can help. Door replacement is a different trade.