OP here. Thanks for all the replies.
We had a handman come in to check. It looks like the water is coming in from the Patio Rafters (term I looked up, basically the wood that is going into the wall to support the patio) and the plywood next to the door is damaged, mold in a small area of the plywood).
Handman cut out several small portions of the drywall to check the damage. It looks like one of the support beams (I am making up the terminology) i.e. 2x6 wood beams is starting to get spoiled as well.
Suggestion is to replace the wood beam and the plywood. To change the wood beam, it seems they have to lift the portion of the house under the beam a tiny bit and put in a new 2x6 beam.
He is going to clean and seal the area around Patio Rafters with something so that water wont get in anymore. He is going to do that tomorrow. I want to research the "whole lift home and put a new 2x6 beam" which sounds little too much to me.
Anyone who knows something about this, could you please comment and provide feedback?
I am a complete newbee to this.
Thank you!