Cabrio 3RD Brake light removal

[boomer5]

I have a '92 cabriolet with a leaking 3rd brake light gasket, probably due to the brake light cover being warped.Ive removed the four securing screws on the underside of trunklid ,but can't remove the brake light assembly.It seems to still be secured by a screw located towards the rear of the assembly.Anyone have any tips on how to remove the assembly at this point?