Re: Water leaking into left front passenger footwell.
Did more investigating this weekend. Ran lots of water, flowed on windshield, and lower corner in particular - no leakage. Ran water down sunroof drain, it pours out the other end with no problem. Not source of leak. I can see the rubber tube inside the A-Pillar vent for the side window defroster and it is dry. Given the spot where the damp carpet first begins, right at the right kick panel, I now believe the source is one of the bolts through the A pillar weeping water. It isn't the rubber wiring boot or body plugs.
Given how much water has to flow to cause leakage, it has to be something very small that accumulates over many hours of very heavy rain, one tiny droplet at a time. There are five bolts though the A pillar, four door hinge bolts and one very suspect one with a tab that holds the front fender sheet metal. That one has a nice gap to trap water flow. I sealed them all using clear coat acrylic lacquer flowed all around the bolts and hinge tabs with a syringe. We shall see. Can't see the dealer finding this leak as it would take days of investigating. If this does not work then I'll let them go at it, but I'd rather try this first before having them rip the car apart.