Just pull the light strip off. It's held on with adhesive. The goop on the ends is just some sort of caulk. You'll probably have some residue left that can be removed with Goof-Off or some other solvent. The wire harness will pull out of the hole that on mine seems to have been drilled with a rock. Cut the wires and attach the new ones. S
tick the light strip on and seal the ends with silicone sealer or some form of caulk.