Re: 03 tacoma drivers grab bar water leak
I agree - the most likely cause is a pinhole leak in either the upper windshield seal or the upper door sill.
If it happens again (you meant you *can't* replicate it, right? ...) try to determine if it occurs while the truck is parked or only when it's been driven. If moving is required to get the leak, that would suggest it's the windshield seal.
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