How do you replace the reverse/backup lights on an 07 toyota solara?

You should be able to access the light from inside the trunk...pull the panel back and you should see the back ot the bulbs...just look for the bulb that is aligned with the white portion of the tail light assembly and remove and replace it. should be pretty easy to get to. most of the bulbs are the same so I would remove the brake light and if it is the same, install it in the back up light slot to see if it resolves the problem. If so, go ahead and replace the bulbs. Good luck