I will sugget the leak may be the interface ribbon.
It is a cloth that is sewn around two rubber solids that hold if to the coach.
Ours rotted away and it leaked like crazy.
Suggestion to all with this awning.
Visit a hardware store and get about a foot of small chain, cut into two pieces, then at each end of awning attach chain to awning aluminum cover with good screw or nut and bolt, other end to trip rail screw.
Awning cannot get away, PO did that on ours, saved our butt when we deployed it first time.
Tony & Lori
1989 Country Coach Savannah SE