Can’t say I have an answer, but I have a similar problem that’s getting annoying. My driver’s side floor board gets soaked anytime it rains, but I can’t find anywhere that water may be leaking through a window or door. Is there a way to test? A guy at the dealership looked at me befuddled and said he had no idea…2000 Toyota Camry, 210,000 miles…still runs smoothly…