JMV1210, Mine did the same after the dealer installed my SMA light bar, first they claim it was the door seal and ordered a new kit, the install it and 2 days later the water was back in the cabin under the driver's carpet
well after 3 trips and 3 1/2 weeks later the problem was where they passed the wire harness under the roof driver side marker, thay had to re-seal it with silicone and now for 2 weeks and multiple car washes it still dry; so it seems that thay fix it this time
Good luck and let us know if you are able to fix it.