u/New-Tumbleweed4025

We had a heavy wind and rain storm last night and woke up to ceiling damage. The damage is on the other side of the red mark extending approximately 12" from the exterior wall. Our house was built 5 years ago. Any thoughts on how we can find the leak and could we repair with a good waterproof sealant or will we need to do a larger repair?

I'm sure we will call in the professionals but seeing as professionals installed this I like to have a little bit of knowledge before making the call. Thank you in advance.