Yesterday, I had the front cap/roof seam, left corner trim and a running light fixture resealed. Checked trailer today after the rain started and I still have a leak. Last month I replaced the rubber seal on the outside perimeter of the front window. The rubber seal had pulled into in that same corner.
I have a leak on the left side in the area right under one of those L-shaped brackets that lock the front window cover in the down position. I suspect the pop rivots and/or the holes are allowing a slow leak. I am going to apply some clear silicone over the area to see if this will stop the leak.
Good luck to me.