OK, I think I found the leak source. It looks like the caulking at the front lower corner of the awning, between the awning box and the opening for the box. I ran water over the entire awning area and no water leaked in until water was directed to this area. My wife watched inside while I did this.
I retracted the awning to get some extra working room and then I pulled out all of the old silicone - it appeared to be a repair made some time ago as it was generously applied to every crack, rivet and seam - and then used Lexel to form a new bead around the entire area.
It will be rainy in the next few days so I can see if it solved the problem. However, while the awning was out I checked the other end and noticed that the entire awning box was pulled away from the body. I can only guess that the mounting hardware is loose or maybe the nuts came off. I found two nuts missing from the front mounting bolts while having repairs done at BCS.
Does anyone know how to access this hardware? I fear it is behind the refrigerator.
Just looked at the post and the picture is rotated 90 degrees counterclockwise. Not sure why it did that or how to fix it.
(Re-Corrected orientation and re-posted photo. Steve Huber)