I pulled the pillar trim at rear seatbelts, rear ceiling grab handles, overhead light assembly, rear ceiling accessory mounts, loosened the rear plastic window trim on each side and then let the headliner down. The drains exit on each side to the outside of the rear hatch hinges and the tubes can be removed through the outside and new ones inserted and routed properly. I also placed zip ties on the rubber connections of the new drain tubes at the sunroof assembly. I did not access the front ones that exit down the front pillars on either side of the windshield as I have not had any leaking to the front.