My fix for the L405 Range Rover sunroof leak. I could not find a repair procedure for this, and assume that based on part availability, the dealers would replace the entire sunroof unit. The entire sunroof assembly is over $3,000 dollars. We ran this car through a car wash after this fix and all is nice and dry now. Will report back in on how the drains are holding up over time.

Items used for this fix:
Tools
3/8" drill bit
Tubing flaring kit: https://a.co/d/hV292y5
Door Tools/Pick and Removal Kit: https://a.co/d/evQPs5M
All Data DIY Reference for how to drop headliner: https://my.alldata.com

Material
3/8" OD copper tubing
Permatex Right Stuff Sealant