One potential problem area you can.
Patio door frame leaking.
I plan to seal.
Solution is a tight bottom sweep doorseal and a rain splashguard or dripcap on the bottom outer face of door like the following link the type i use unless a fancy appearing one is desired easy to diy on most doors.
6 rain hitting threshold and running down door face is splashing seeping under door on top of the threshold.
If you cannot re create the leak problem inspect the interior of the door for stains or rust.
Causes of door leaks there are many potential pathways for water to leak in through a door but the biggest opening is of course the doorway itself.
How to stop water leaks under a door frame.
How to get rid of water in your patio sliding door wall.
Test the door for the location of the leak.
The gutters are clear and the patio is level.
It may seem obvious but a door left open or one that cannot be closed tightly because of wear and tear is a significant problem during a storm.
Simply remove the corner pad s adhesive backing and stick the small square pad to the insides of your door frame at the crucial corners.
Aim a garden water hose with a sprayer set on mist or low at the outside of the sliding door.
Some areas like your roof are obvious locations.
Spray the door and look for the leak location.
There are many places where water can leak into your home.