Found the leak in my Bonn - driver side door column, just below the hood latch.
The source of the leak is a drain hole in the upper firewall, right below the hood'* hinge. Photos below.
Even tho water seems to drain out fine under the door, I'm guessing from all the visible leaves and crap, that some of it went into the hole and blocked something.
Does anyone know how I can access this area?
I think I need to pull the front wheel off and remove the plastic housing around the wheel well.