I’ve been having problems with a leak in the driver floor board. I’ve taken it to the dealership and the drains weren’t clogged and they couldn’t find any leaks, but my floorboard says otherwise. We had a hard rain 2 nights ago and water was dripping from my lights at my DVD player. Yesterday I noticed a water stain on the roof that went from the middle seat all the way to the back seat. What could cause this? I feel I have had nothing but problems with this Tahoe.

 

Did you pay for the dealer investigation? Because you paid for a fix, and not a guess. If so, request a refund or dispute through your credit card company.
Try an independent mechanic if out of warranty.