Well, now we have two with the same issue here and maybe we can get lucky and someone will have a reply!

It only leaks during a heavy rain storm, light drizzles are not a problem. I have in the recent past wiped down the tracks and used a light spray lubricant on the tracks for the ease of operations but have not spotted anything obvious to indicate source of leak. It drips over head of the passenger side keeps wife busy as co-pilot wiping down the headliner/roof seam

Soooooo, much obliged hope someone has some help. thanks all Leon H