There was a thread here awhile back where a member had tracked down such a leak to an area where the body pinch weld seam sealants hadn't been applied adequately.
IIRC, he ended up removing the passenger front fender, cladding, and wheel well liner, then applying extra sealant to about every body panel seam he could see where the leakage could possibly originate.
Some have also had their windshields replaced and eliminated the leak.
For what it's worth, I had a similar situation one time when my VX had been parked on a driveway with an uphill incline during a rainstorm. Ever since that incident, I've always parked the VX nose down, and have not found any water that's leaked inside again.