Heat gun and warm the outer edges all the way around it and pull up gently.. just gotta warm the sealant to its goo form again..
get some rtv sealer and seal it back up, place a heavy object on it for a few hrs to ensure a good seal..
Do you know if there is a different technique for a light from a full wing as opposed to a F6B? I know the tail light assembly itself is slightly different between the two.
I saw where people heat oven to 200degrees, put light assembly in for 20minutes and then remove lense.