OK, here's what they did to locate the leak.

1) they applied heavy car-washing foam to the exterior of the windshield and surrounding area.

2) one guy stands outside of the VX and watches them foam while another gets inside the VX and blows compressed air around the windshield and under the dash.

3) when bubbles appear, they've found the location of the leak.

The leak in my VX appeared along an area just below the lower winshield seal and the A-post. Which is why, at first,. they concluded it must be a windshield seal.

To get to the leak, the dealer carefully loosened the cowling surrounding the windshield wiper mechanism. I think this is a plate held-down by 4 phillips-head screws. They carefully bent the cowling out of the way from near the hood hinge, respecting the limits of its elasticity, and were able to find the small gap in the welding and seal it (No fenders were molested in this scenario).

I asked my service rep, who is a former Isuzu regional rep, about VX4EJR's observation of an offset in the moulding and whether it might be a persistent occurrence for the VX. Having seen Isuzu's Japanese production process, he says "if it appears in one, it likely appears in others, since Japanese auto production is remarkably consistent, right-down to the "signature" work of individuals who might assemble a vehicle like the VX that has so much hand-craftmanship".

VX4EJR, if you are able to establish a connection between your observation and a potential offset in the body assembly, I now know of at least one long-time Isuzu-man that would be very interested in learning-about your findings. From his interest, I inferred that even if the VX is no longer in production, letting Isuzu know where design and/or production performance gaps occur, helps them build better products in the future.