New MVS Forums member popphl explains how to replace 2008+ V70 and XC70 tail light lenses:
Just wanted to share since it took me a bit of googling and sweat to complete what seemed as though it should have been a simple job.
I replaced the right lower tail light lens assembly, which was damaged in a parking mishap.
The part was about $120. To replace the assembly, you remove a carpet panel from the cargo area to access the taillight from inside. Remove 3 nuts from the retaining posts with a 10mm deep socket wrench — the access hole is very small, so you may have to turn it with your fingers.
There are still two tabs holding the assembly on, and you’ll have to partially pull off the bumper cover to access them. There are 4 torx screws in the wheel well area holding the bumper cover on, the lowest of which is pretty close to the tire. I had to attach a T20 bit to a screwdriver with a 90-degree bending head in order to get it off. Then there is one more screw under the rubber pad where the liftgate hits when it closes. Once those 5 screws are out, you can pop off that side of the bumper and remove the 2 hex head lugs that are holding on the bottom of the taillight assembly. You should be able to lift it, disconnect the wiring harness, and put in the new one.